Gogo (GOGO) 10-K 21 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 19, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Entity Registrant Name	Gogo Inc.
Entity Central Index Key	1,537,054
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 275,249,580
Trading Symbol	GOGO
Entity Common Stock, Shares Outstanding		87,560,694
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 184,155	$ 196,356
Short-term investments	39,323	212,792
Total cash, cash equivalents and short-term investments	223,478	409,148
Accounts receivable, net of allowances of $500 and $587, respectively	134,308	117,896
Inventories	193,045	45,543
Prepaid expenses and other current assets	34,695	20,310
Total current assets	585,526	592,897
Non-current assets:
Property and equipment, net	511,867	656,038
Goodwill and intangible assets, net	83,491	87,133
Other non-current assets	84,212	67,107
Total non-current assets	679,570	810,278
Total assets	1,265,096	1,403,175
Current liabilities:
Accounts payable	23,860	27,130
Accrued liabilities	212,459	201,815
Deferred revenue	38,571	43,448
Deferred airborne lease incentives	24,145	42,096
Current portion capital leases	652	1,789
Total current liabilities	299,687	316,278
Non-current liabilities:
Long-term debt	1,024,893	1,000,868
Deferred airborne lease incentives	129,086	142,938
Other non-current liabilities	80,191	134,655
Total non-current liabilities	1,234,170	1,278,461
Total liabilities	1,533,857	1,594,739
Commitments and contingencies (Note 15)
Stockholders' deficit
Common stock, par value $0.0001 per share; 500,000,000 shares authorized at December 31, 2018 and 2017; 87,678,812 and 87,062,578 shares issued at December 31, 2018 and 2017, respectively; and 87,560,694 and 86,843,928 shares outstanding at December 31, 2018 and 2017, respectively	9	9
Additional paid-in-capital	963,458	898,729
Accumulated other comprehensive loss	(3,554)	(933)
Accumulated deficit	(1,228,674)	(1,089,369)
Total stockholders' deficit	(268,761)	(191,564)
Total liabilities and stockholders' deficit	$ 1,265,096	$ 1,403,175

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowances on accounts receivable	$ 500	$ 587
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	87,678,812	87,062,578
Common stock, shares outstanding	87,560,694	86,843,928

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Total revenue	$ 893,764	$ 699,090	$ 596,550
Operating expenses:
Cost of service revenue (exclusive of items shown below)	291,642	268,334	226,078
Cost of equipment revenue (exclusive of items shown below)	222,244	58,554	48,650
Engineering, design and development	120,090	133,286	96,713
Sales and marketing	58,823	64,017	61,177
General and administrative	94,269	93,671	84,927
Depreciation and amortization	133,617	145,490	105,642
Total operating expenses	920,685	763,352	623,187
Operating loss	(26,921)	(64,262)	(26,637)
Other (income) expense:
Interest income	(4,292)	(2,964)	(1,635)
Interest expense	122,809	111,944	83,647
Loss on extinguishment of debt	19,653		15,406
Adjustment of deferred financing costs			(792)
Other (income) expense	233	750	(72)
Total other expense	138,403	109,730	96,554
Loss before income taxes	(165,324)	(173,992)	(123,191)
Income tax provision (benefit)	(3,293)	(1,997)	1,314
Net loss	$ (162,031)	$ (171,995)	$ (124,505)
Net loss attributable to common stock per share-basic and diluted	$ (2.02)	$ (2.17)	$ (1.58)
Weighted average number of shares-basic and diluted	80,038	79,407	78,915
Service [Member]
Revenue:
Total revenue	$ 630,147	$ 617,906	$ 514,293
Product [Member]
Revenue:
Total revenue	$ 263,617	$ 81,184	$ 82,257

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	$ (162,031)	$ (171,995)	$ (124,505)
Currency translation adjustments, net of tax									(2,621)	1,230	25
Comprehensive loss									$ (164,652)	$ (170,765)	$ (124,480)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net loss	$ (162,031)	$ (171,995)	$ (124,505)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization	133,617	145,490	105,642
Loss on asset disposals, abandonments and write-downs	13,352	8,960	4,583
Gain on transition to airline-directed model	(21,551)
Deferred income taxes	(3,821)	(2,281)	839
Stock-based compensation expense	16,912	19,821	17,621
Amortization of deferred financing costs	4,280	3,743	3,803
Accretion and amortization of debt discount and premium	18,255	18,286	17,496
Loss on extinguishment of debt	19,653		15,406
Adjustment of deferred financing costs			(792)
Changes in operating assets and liabilities:
Accounts receivable	(17,064)	(43,798)	(4,265)
Inventories	(50,762)	4,723	(29,329)
Prepaid expenses and other current assets	(3,106)	4,990	(14,473)
Contract assets	(30,485)
Accounts payable	(3,864)	3,402	(3,118)
Accrued liabilities	13,281	24,941	4,982
Deferred airborne lease incentives	(7,705)	20,407	14,652
Deferred revenue	(1,021)	21,477	26,981
Accrued interest	(955)	7,213	35,825
Warranty reserves	8,009	(152)	742
Other non-current assets and liabilities	(7,305)	(4,971)	(7,102)
Net cash provided by (used in) operating activities	(82,311)	60,256	64,988
Investing activities:
Purchases of property and equipment	(108,632)	(252,375)	(148,294)
Acquisition of intangible assets-capitalized software	(23,031)	(27,855)	(28,587)
Purchases of short-term investments	(39,323)	(317,418)	(363,436)
Redemptions of short-term investments	212,792	443,103	244,450
Other, net		(2,850)	84
Net cash provided by (used in) investing activities	41,806	(157,395)	(295,783)
Financing activities:
Proceeds from issuance of convertible notes	237,750
Redemption of convertible notes	(200,438)
Proceeds from issuance of senior secured notes		181,754	525,000
Payments on amended and restated credit agreement			(310,132)
Payment of debt issuance costs	(8,054)	(3,630)	(11,474)
Payments on capital leases	(2,340)	(2,961)	(2,612)
Stock-based compensation activity	396	(227)	271
Net cash provided by financing activities	27,314	174,936	201,053
Effect of exchange rate changes on cash	578	743	(522)
Increase (decrease) in cash, cash equivalents and restricted cash	(12,613)	78,540	(30,264)
Cash, cash equivalents and restricted cash at beginning of period	203,729	125,189	155,453
Cash, cash equivalents and restricted cash at end of period	191,116	203,729	125,189
Less: current restricted cash	1,535	500	114
Less: non-current restricted cash	5,426	6,873	7,773
Cash and cash equivalents at end of period	184,155	196,356	117,302
Supplemental Cash Flow Information:
Cash paid for interest	101,489	86,359	27,535
Cash paid for taxes	401	103	305
Non-cash Investing and Financing Activities:
Purchases of property and equipment in current liabilities	18,640	53,682	39,492
Purchases of property and equipment paid by commercial airlines	7,474	23,762	13,804
Purchases of property and equipment under capital leases	279	1,082	2,177
Acquisition of intangible assets in current liabilities	312	1,483	1,623
Acquisition of intangible assets in non-current liabilities	1,375
Asset retirement obligation	$ 760	$ 370	$ 11

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2015	$ 66,195	$ 9	$ 861,243	$ (2,188)	$ (792,869)
Beginning Balance, Shares at Dec. 31, 2015		85,913,206
Net loss	(124,505)				(124,505)
Currency translation adjustments, net of tax	25			25
Stock-based compensation expense	17,621		17,621
Issuance of common stock upon exercise of stock options	110		110
Issuance of common stock upon exercise of stock options, Shares		12,150
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares		227,429
Tax withholding related to vesting of restricted stock units	(1,199)		(1,199)
Issuance of common stock in connection with employee stock purchase plan	1,360		1,360
Issuance of common stock in connection with employee stock purchase plan, Shares		143,085
Ending Balance at Dec. 31, 2016	(40,393)	$ 9	879,135	(2,163)	(917,374)
Ending Balance, Shares at Dec. 31, 2016		86,295,870
Net loss	(171,995)				(171,995)
Currency translation adjustments, net of tax	1,230			1,230
Stock-based compensation expense	19,821		19,821
Issuance of common stock upon exercise of stock options	449		449
Issuance of common stock upon exercise of stock options, Shares		50,392
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares		344,038
Tax withholding related to vesting of restricted stock units	(2,162)		(2,162)
Issuance of common stock in connection with employee stock purchase plan	1,486		1,486
Issuance of common stock in connection with employee stock purchase plan, Shares		153,628
Ending Balance at Dec. 31, 2017	(191,564)	$ 9	898,729	(933)	(1,089,369)
Ending Balance, Shares at Dec. 31, 2017		86,843,928
Net loss	(162,031)				(162,031)
Currency translation adjustments, net of tax	(2,621)			(2,621)
Stock-based compensation expense	16,912		16,912
Issuance of common stock upon exercise of stock options	21		21
Issuance of common stock upon exercise of stock options, Shares		2,500
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares		393,361
Tax withholding related to vesting of restricted stock units	(1,181)		(1,181)
Issuance of common stock in connection with employee stock purchase plan	1,556		1,556
Issuance of common stock in connection with employee stock purchase plan, Shares		320,905
Issuance of 2022 Convertible Notes (including issuance costs)	47,421		47,421
Impact of the adoption of ASC 606	22,726				22,726
Ending Balance at Dec. 31, 2018	$ (268,761)	$ 9	$ 963,458	$ (3,554)	$ (1,228,674)
Ending Balance, Shares at Dec. 31, 2018		87,560,694

Background

Background	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Background	1. Background Gogo (“we,” “us,” “our”) is the global leader in providing broadband connectivity solutions and wireless in-flight entertainment to the aviation industry. We operate through the following three segments: Commercial Aviation North America, or “CA-NA,” Commercial Aviation Rest of World, or “CA-ROW,” and Business Aviation, or “BA.” Services provided by our CA-NA and CA-ROW businesses include Passenger Connectivity, which allows passengers to connect to the Internet from their personal Wi-Fi-enabled devices; Passenger Entertainment, which offers passengers the opportunity to enjoy a broad selection of in-flight entertainment options on their personal Wi-Fi enabled devices; and Connected Aircraft Services (“CAS”), which offers airlines connectivity for various operations and currently include, among other services, real-time credit card transaction processing, electronic flight bags and real-time weather information. Services are provided by CA-NA on commercial aircraft flying routes that generally begin and end within North America, which for this purpose includes the United States, Canada and Mexico. CA-ROW provides service on commercial aircraft operated by foreign-based commercial airlines and flights outside of North America for North American-based commercial airlines. The routes included in our CA-ROW segment are those that begin and/or end outside of North America (as defined above) on which our international service is provided. BA provides in-flight Internet connectivity and other voice and data communications products and services and sells equipment for in-flight telecommunications to the business aviation market. BA services include Gogo Biz, our in-flight broadband service, Passenger Entertainment, our in-flight entertainment service, and satellite-based voice and data services through our strategic alliances with satellite companies.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Principles of Consolidation – The consolidated financial statements include our wholly owned subsidiaries. All intercompany transactions and account balances have been eliminated. Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates the significant estimates and bases such estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. However, actual results could differ materially from those estimates. Reclassifications - To conform to the current year presentation, certain amounts in our 2017 and 2016 consolidated statements of cash flows have been reclassified. Specifically, for the years ended December 31, 2017 and 2016, current deferred rent of $174 thousand and $73 thousand, respectively, has been combined with accrued liabilities, and non-current deferred rent of $798 thousand and $120 thousand, respectively, has been combined with other non-current assets and liabilities. Additionally, warranty reserves is now separately stated in its own line, which was included in accrued liabilities previously. Significant Risks and Uncertainties —Our operations are subject to certain risks and uncertainties, including without limitation those associated with continuing losses, fluctuations in operating results, funding of business expansion, strategic alliances, capacity constraints, managing rapid growth and expansion, relationships with customers, suppliers and distributors, financing arrangement terms that may restrict operations, regulatory issues, competition, the economy, technology trends and evolving industry standards. Cash, Cash Equivalents and Short-Term Investments— We consider cash and cash equivalents to be short-term, highly liquid investments that have the following characteristics: readily convertible to known amounts of cash, so near their maturities that there is insignificant risk of changes in value due to any changes in market interest rates, and having maturities of three months or less when purchased. We continually monitor positions with, and the credit quality of, the financial institutions with which we invest. The carrying amounts reported in the balance sheets for cash and cash equivalents approximate the fair market value of these assets. We consider short-term investments to be investments with maturities of twelve months or less (but greater than three months). Currently all our short-term investments are comprised of U.S. Treasury bills, which we intend to hold to maturity. Certain cash amounts are restricted as to use and are classified outside of cash and cash equivalents. See Note 7, “Long-term Debt and Other Liabilities,” for further details. Concentrations of Credit Risk— Financial instruments that potentially subject us to a concentration of credit risk consist principally of cash and cash equivalents, short-term investments and accounts receivable. All cash and cash equivalents are invested with creditworthy financial institutions. We perform ongoing credit evaluations and generally do not require collateral to support receivables. Our short-term investments are all comprised of U.S. Treasury bills. See Note 11, “Business Segments and Major Customers,” for further details. Income Tax— We use an asset- and liability-based approach in accounting for income taxes. Deferred income tax assets and liabilities are recorded based on the differences between the financial statement and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the tax differences are expected to reverse. Valuation allowances are provided against deferred tax assets which are not likely to be realized. On a regular basis, management evaluates the recoverability of deferred tax assets and the need for a valuation allowance. We also consider the existence of any uncertain tax positions and, as necessary, provide a reserve for any uncertain tax positions at each reporting date. See Note 14, “Income Tax,” for further details. Inventories— Inventories consist primarily of telecommunications systems and parts, and are recorded at the lower of cost (average cost) or market. We evaluate the need for write-downs associated with obsolete, slow-moving and nonsalable inventory by reviewing net realizable inventory values on a periodic basis. Historically, inventories were solely related to the BA segment. Starting in 2018, the airborne equipment within our CA-NA and CA-ROW segments became increasingly deployed under airline-directed model agreements (see “Revenue Recognition,” below for additional details), and we now allocate uninstalled airborne equipment between property and equipment, net, and inventories, based on our forecasts of estimated future installations by contract type. Prior to this allocation, uninstalled airborne equipment for the CA-NA and CA-ROW segments was classified as property and equipment, net, as the majority of installations were performed under our turnkey model agreements. See “Arrangements with Commercial Airlines,” below for additional information on the turnkey model treatment. See Note 5, “Composition of Certain Balance Sheet Accounts,” for further details. Property and Equipment and Depreciation— Depreciation expense totaled $107.1 million, $120.6 million and $84.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. Depreciation of property and equipment is computed using the straight-line method over the estimated useful lives for owned assets, which are as follows: Office equipment, furniture, fixtures and other 3-7 years Leasehold improvements 3-13 years Airborne equipment 7 years Network equipment 5-25 years See Note 5, “Composition of Certain Balance Sheet Accounts,” for further details. Improvements to leased property are amortized over the shorter of the useful life of the improvement or the term of the related lease. Repairs and maintenance costs are expensed as incurred. Due to advances in technology and changes in agreements with our airline partners, with respect to upgrading equipment, we periodically reassess the useful lives of our property and equipment. Such reassessment has resulted in the useful life of specific assets being adjusted to a shorter period than originally estimated, resulting in an increase in annual depreciation expense for those assets. Goodwill and Other Intangible Assets— Goodwill and other intangible assets with indefinite lives are not amortized, but are reviewed for impairment at least annually or whenever events or circumstances indicate the carrying value of the asset may not be recoverable. Our FCC Licenses (as defined in Note 6, “Intangible Assets”) are our only indefinite-lived intangible assets. We perform our annual impairment tests of goodwill and our FCC Licenses during the fourth quarter of each fiscal year. We assess qualitative factors to determine the likelihood of impairment. Our qualitative analysis includes, but is not limited to, assessing the changes in macroeconomic conditions, regulatory environment, industry and market conditions, financial performance versus budget and any other events or circumstances specific to goodwill and the FCC Licenses. If it is more likely than not that the fair value of goodwill and the FCC Licenses is greater than the carrying value, no further testing is required. Otherwise, we will apply the quantitative impairment test method. Our quantitative impairment testing of the FCC Licenses uses the Greenfield method, an income-based approach. When performing this quantitative impairment testing, we estimate the fair value of the goodwill and FCC Licenses asset balances based primarily on projected future operating results, discounted cash flows, and other assumptions. Projected future operating results and cash flows used for valuation purposes may reflect considerable improvements relative to historical periods with respect to, among other things, revenue growth and operating margins. Although we believe our projected future operating results and cash flows and related estimates regarding fair values are based on reasonable assumptions, projected operating results and cash flows may not always be achieved. The failure to achieve one or more of our assumptions regarding projected operating results and cash flows in the near term or long term could reduce the estimated fair value below carrying value and result in the recognition of an impairment charge. The results of our annual goodwill and indefinite-lived intangible asset impairment assessments for 2018, 2017 and 2016 indicated no impairment. Intangible assets that are deemed to have a finite life are amortized over their useful lives as follows: Software 3-8 years OEM and dealer relationships 10 years Service customer relationships 5-7 years Other intangible assets 4-10 years See Note 6, “Intangible Assets,” for further details. Long-Lived Assets— We review our long-lived assets to determine potential impairment whenever events indicate that the carrying amount of such assets may not be recoverable. We do this by comparing the carrying value of the long-lived assets with the estimated future undiscounted cash flows expected to result from the use of the assets, including cash flows from disposition. If we determine an impairment exists, the asset is written down to estimated fair value. There were no impairments of long-lived assets in 2018, 2017 and 2016. Arrangements with Commercial Airlines— Pursuant to contractual agreements with our airline partners, we place our equipment on commercial aircraft operated by the airlines for the purpose of delivering our service to passengers on the aircraft. There are currently two types of commercial airline arrangements: turnkey and airline-directed. See “Revenue Recognition,” below for additional information on the airline-directed model. Under the turnkey model, we account for equipment transactions as operating leases of space for our equipment on the aircraft. We may be responsible for the costs of installing and/or deinstalling the equipment. Under the turnkey model, the equipment transactions involve the transfer of legal title but do not meet sales recognition for accounting purposes because the risks and rewards of ownership are not fully transferred due to our continuing involvement with the equipment, the length of the term of our agreements with the airlines, and restrictions in the agreements regarding the airlines’ use of the equipment. Under the this model, we refer to the airline as a “partner.” Under the turnkey model, the assets are recorded as airborne equipment on our consolidated balance sheets, as noted in Note 5, “Composition of Certain Balance Sheet Accounts.” Any upfront equipment payments are accounted for as lease incentives and recorded as deferred airborne lease incentives on our consolidated balance sheets and are recognized as a reduction of the cost of service revenue on the straight-line basis over the term of the agreement with the airline. See Note 15, “Leases,” for further details. Transition to Airline-Directed Model —The accounting treatment for one of our airline agreements transitioned from our turnkey model to our airline-directed model in January 2018 due to specific provisions elected by the airline that resulted in the transfer of control of the previously installed connectivity equipment. Upon transition to the airline-directed model, the net book value of all previously delivered equipment classified within property and equipment was reclassified to cost of equipment revenue. Additionally, the unamortized proceeds previously received for equipment and classified within current and non-current deferred airborne lease incentives were eliminated and included as part of estimated contract value, which was then allocated amongst the various performance obligations under the agreement. The value allocated to previously delivered equipment was immediately recognized as equipment revenue in our consolidated financial statements; see “Revenue Recognition,” below for additional disclosures relating to the allocation of consideration among identified performance obligations. For amounts recognized in equipment revenue that were in excess of the amounts billed, we recorded current and non-current contract assets included within prepaid expenses and other current assets and other non-current assets, respectively; see “Revenue Recognition,” below for additional details. In connection with the transition of this airline agreement to the airline-directed model, we also established warranty reserves related to previously sold equipment that are still under a warranty period, which is included within accrued liabilities. See Note 5, “Composition of Certain Balance Sheet Accounts,” for additional information. This transition from the turnkey model to the airline-directed model occurred on January 4, 2018 and the total financial statement effect on our consolidated balance sheet and consolidated statement of operations was as follows ( in thousands ): Increase (decrease) Consolidated balance sheet Prepaid expense and other current assets $ 6,603 Property and equipment, net (32,716 ) Other non-current assets 18,783 Accrued liabilities 2,000 Current deferred airborne lease incentive (13,592 ) Non-current deferred airborne lease incentive (17,289 ) Consolidated statement of operations Equipment revenue 45,396 Cost of equipment revenue 23,845 Revenue Recognition Our revenue is primarily earned from providing connectivity and entertainment services and through sales of equipment. Additionally, to a lesser extent, we earn revenue from providing ancillary services, including installation and CAS. We determine revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue as we satisfy the performance obligations. For CA-NA and CA-ROW, pursuant to contractual agreements with our airline partners, we place our equipment on commercial aircraft operated by the airlines in order to deliver our service to passengers on the aircraft. We currently have two types of commercial airline arrangements: turnkey and airline-directed. Under the airline-directed model, we have transferred control of the equipment to the airline and therefore the airline is our customer in these transactions. Under the turnkey model, while our airline partner generally has legal title to our equipment, we do not transfer control of our equipment to our airline partner and, as a result, the airline passenger is deemed to be our customer. Transactions with our airline partners under the turnkey model are accounted for as an operating lease of space on an aircraft. See “Arrangements with Commercial Airlines,” above for additional information on the turnkey model. CA-NA and CA-ROW Service Revenue : CA-NA and CA-ROW revenue consists of service revenue primarily derived from connectivity services, and, to a lesser extent, from Entertainment services and CAS. Connectivity is provided to our customers using both our ATG and satellite technologies. Airline-directed connectivity revenue : As noted above, under the airline-directed model, the airline is our customer and we earn service revenue as connectivity services are consumed directly by the airline or indirectly by passengers. Turnkey connectivity revenue (passenger connectivity): Under the turnkey model, passenger connectivity revenue is generated by services paid for by passengers, airlines and third parties. Passenger paid revenue represents point-of-sale sessions (which may be flight-based, time-based, multiple individual session packages (“multi-pack”) or subscriptions). Flight-based, time-based and multi-pack revenue is recognized when the sessions are used. Subscription revenue is recognized evenly throughout the subscription period, regardless of the number of times the customer uses the network. Third party and airline-paid revenue is generated by sales of connectivity services to airlines or third parties in sponsorship, wholesale, enterprise and roaming arrangements. Sponsorship revenue is recognized over the sponsorship term. Revenue from wholesale, enterprise and roaming arrangements is recognized as sessions are used by the passenger. Entertainment revenue: Entertainment revenue consists of entertainment services we provide to the airline for use by its passengers. Revenue is recognized as the services are provided to the airline. CAS: CAS includes, among other things, real-time credit card transaction processing, electronic flight bags and real-time weather information. Revenue is recognized as the service is provided. BA Service Revenue : BA service revenue primarily consists of monthly subscription and usage fees paid by aircraft owners and operators for telecommunication, data, and in-flight entertainment services. Revenue is recognized as the services are provided to the customer. Equipment Revenue : Equipment revenue primarily consists of the sale of ATG and satellite connectivity equipment and the sale of entertainment equipment. CA-NA and CA-ROW recognize equipment revenue upon acceptance by our airline customers. BA recognizes equipment revenue when the equipment is shipped to OEMs and dealers. Equipment revenue also includes revenue generated by the installation of the connectivity or entertainment equipment on commercial aircraft, which is recognized when the installation is complete. Contract price and allocation considerations : Our CA-NA and CA-ROW airline-directed contracts contain multiple performance obligations, which primarily include the sale of equipment, installation services, connectivity services and entertainment services. For these contracts, we account for each distinct good or service as a separate performance obligation. We allocate the contract’s transaction price to each performance obligation using the relative standalone selling price, which is based on the actual selling price for any good or service sold separately to a similar class of customer, if available. To the extent a good or service is not sold separately, we use our best estimate of the standalone selling price and maximize the use of observable inputs. The primary method we use to estimate the standalone selling price is the expected cost-plus margin approach. The contractual consideration used for allocation purposes includes connectivity and entertainment services, which may be based on a fixed monthly fee per aircraft or a variable fee based on the volume of connectivity activity, or a combination of both. Examples of variable consideration within our contracts include megabyte overages and pay-per-use sessions. We constrain our estimates to reduce the probability of a significant revenue reversal in future periods, allocate such variable consideration to the identified performance obligations and recognize revenue in the period the services are provided. Our estimates are based on historical experience, anticipated future performance, market conditions and our best judgment at the time. A significant change in one or more of these estimates could affect our estimated contract value, and we regularly review and update our estimates and recognize adjustments under the cumulative catch-up method. Any adjustment under this method is recorded as a cumulative adjustment in the period identified and revenue for future periods is recognized using the new adjusted estimate. Research and Development Costs— Software Development Costs— We capitalize costs for network and non-network software developed or obtained for internal use during the application development stage. These costs include purchased software and direct costs associated with the development and configuration of internal use software that supports the operation of our service offerings. These costs are included in goodwill and intangible assets, net in our consolidated balance sheets and, when the software is placed in service, are amortized on a straight-line basis over their estimated useful lives. Costs incurred in the preliminary project and post-implementation stages, as well as maintenance and training costs, are expensed as incurred. With respect to software sold as part of our equipment sales, we capitalize software development costs once technological feasibility has been established. Capitalized software costs are amortized on a product-by-product basis, based on the greater of the ratio that current gross revenues for a product bear to the total of current and anticipated future gross revenues for that product or the straight-line method over the remaining estimated economic life of the product. Warranty— We provide warranties on parts and labor related to our products. Our warranty terms range from two to ten years. Warranty reserves are established for costs that are estimated to be incurred after the sale, delivery and installation of the products under warranty. The warranty reserves are determined based on known product failures, historical experience and other available evidence, and are included in accrued liabilities in our consolidated balance sheets. See Note 5, “Composition of Certain Balance Sheet Accounts,” for the details of the changes in our warranty reserve. Asset Retirement Obligations— We have certain asset retirement obligations related to contractual commitments to remove our network equipment and other assets from leased cell sites upon termination of the site lease and to remove equipment from aircraft when the service contracts terminate. The asset retirement obligations are classified as a noncurrent liability in our consolidated balance sheets. See Note 5, “Composition of Certain Balance Sheet Accounts,” for the details of the changes in our asset retirement obligations. Fair Value of Financial Instruments— We group financial assets and financial liabilities measured at fair value into three levels of hierarchy based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. See Note 10, “Fair Value of Financial Assets and Liabilities,” for further information. Derivatives – In March 2015, we entered into a prepaid forward transaction in which we purchased 7.2 million shares of our common stock for approximately $140 million, with an expected settlement date on or around March 1, 2020 Derivatives and Hedging . See Note 7, “Long-Term Debt and Other Liabilities,” Note 9, “Common Stock and Preferred Stock,” and Note 10, “Fair Value of Financial Assets and Liabilities,” for further information. Convertible Notes – Proceeds received from the issuance of 2022 Convertible Notes and 2020 Convertible Notes (as defined in Note 7, “Long-Term Debt and Other Liabilities”) are initially allocated between a liability component (long-term debt) and an equity component (additional paid-in capital), within the consolidated balance sheet. The fair value of the liability component is measured using rates determined for similar debt instruments without a conversion feature. The carrying amount of the equity component, representing the conversion option, is determined by deducting the fair value of the liability component from the aggregate face value of 2022 Convertible Notes and 2020 Convertible Notes. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. Net Loss Per Share— We calculate basic and diluted net loss per share using the weighted-average number of common shares outstanding during the period. See Note 3, “Net Loss Per Share,” for further information. Stock-Based Compensation Expense— Compensation cost is measured and recognized at fair value for all stock-based payments, including stock options. For time-based vesting stock options, we estimate fair value using the Black-Scholes option-pricing model, which requires assumptions, such as expected volatility, risk-free interest rate, expected life, and dividends. Restricted stock units (“RSUs”) and restricted stock are measured based on the fair market value of the underlying stock on the date of grant. For awards with a market condition (which we have used on a limited basis), we estimated fair value using the Monte Carlo Simulation model, which requires assumptions, such as volatility, risk-free interest rate, expected life and dividends. Our stock-based compensation expense is recognized over the applicable vesting period, and is included in the same operating expense line items in the consolidated statements of operations as the base cash compensation paid to the underlying employees. See Note 12, “Stock-Based Compensation,” for further information. Leases— In addition to our arrangements with commercial airlines which we account for as leases as noted above, we also lease certain facilities, equipment, cell tower space and base station capacity. We review each lease agreement to determine if it qualifies as an operating or capital lease. For leases that contain predetermined fixed escalations of the minimum rent, we recognize the related rent expense on a straight-line basis over the term of the lease. We record any difference between the straight-line rent amounts and amounts payable under the lease as deferred rent, in either accrued liabilities or as a separate line within noncurrent liabilities, as appropriate, in our consolidated balance sheets. For leases that qualify as a capital lease, we record a capital lease asset and a capital lease obligation at the beginning of the lease term at an amount equal to the present value of minimum lease payments during the term of the lease, excluding that portion of the payments that represent executory costs. The capital lease asset is depreciated on a straight-line method over the shorter of its estimated useful life or lease term. See Note 15, “Leases,” for further information. Advertising Costs— Costs for advertising are expensed as incurred. Debt Issuance Costs— We defer loan origination fees and financing costs related to our various debt offerings as deferred financing costs. Additionally, we defer fees paid directly to the lenders related to amendments with our various debt offerings as deferred financing costs. We amortize these costs over the term of the underlying debt obligation using the effective interest method, and include them in interest expense in the consolidated statement of operations. The fees incurred but not paid directly to the lenders in connection with amendments are expensed as incurred to interest expense. Deferred financing costs associated with future debt issuances are written off in the period during which we determine that the debt will no longer be issued. See Note 7, “Long-Term Debt and Other Liabilities” for further information. Comprehensive Loss - Comprehensive loss for the years ended December 31, 2018, 2017 and 2016 is net loss plus unrealized gains and losses on foreign currency translation adjustments. Recently Issued Accounting Pronouncements Revenue recognition related new pronouncements: On January 1, 2018, we adopted Accounting Standards Codification Topic 606, Revenue From Contracts With Customers (“ASC 606”) using the modified retrospective method. As a result, we recognized the cumulative effect of initially applying ASC 606 as an adjustment to the opening balance of retained earnings as of January 1, 2018. Our historical financial statements have not been restated and continue to be reported under the revenue accounting standard in effect for those periods. Prior to the adoption of ASC 606, equipment revenue (and related cost) under some of our CA-NA and CA-ROW segment contracts was deferred and recognized over the life of the contract as the equipment and connectivity services did not meet the requirements to be treated as separate units of accounting. Under ASC 606, these same equipment transactions qualify as standalone performance obligations and, therefore, equipment revenue (and related cost) is recognized upon acceptance by our airline customers. Adoption of the new standard did not materially affect the amount or timing of equipment revenue recognized from our BA segment. Our service revenue across all segments continues to be recognized as the services are provided to customers. In conjunction with the adoption of ASC 606, we also adopted Accounting Standard Codification Subtopic 340-40, Other Assets and Deferred Costs – Contracts with Customers (“ASC 340-40”), which requires the capitalization of costs incurred to obtain or fulfill a contract with a customer. Prior to the adoption of ASC 340-40, we expensed all fulfillment and other costs associated with airline-directed contracts, which were comprised predominantly of costs incurred to obtain supplemental type certificates (“STCs”); these costs are now required to be capitalized and amortized to expense over the life of the contract (and are included within engineering, design and development in our consolidated financial statements). Costs associated with our turnkey contracts are not eligible for capitalization under ASC 340-40 and will continue to be expensed as incurred. The cumulative effect of the adoption of ASC 606 and ASC 340-40 to our consolidated balance sheet as of January 1, 2018 was as follows ( in thousands) : Balances Balance at with December 31, Impact of Adoption of 2017 ASC 606 ASC 606 Assets Inventories $ 45,543 $ 974 $ 46,517 Prepaid expenses and other current assets 20,310 603 20,913 Property and equipment, net 656,038 (4,405 ) 651,633 Other non-current assets 67,107 (30,006 ) 37,101 Liabilities Current deferred revenue 43,448 (7,182 ) 36,266 Other non-current liabilities 134,655 (48,378 ) 86,277 Equity Accumulated deficit (1,089,369 ) 22,726 (1,066,643 ) During the fourth quarter 2018, we identified an additional $0.9 million of property and equipment, net that should have been included in the transition adjustments as of January 1, 2018. The schedule above reflects the additional adjustment. See Note 4, “Revenue Recognition,” for additional information. On January 1, 2018, we adopted ASU 2016-04, Recognition of Breakage for Certain Prepaid Stored-Value Products (“ASU 2016-04”), which amends the guidance on extinguishing financial liabilities for certain prepaid stored-value products by requiring that entities that sell prepaid stored-value products recognize breakage proportionally as the prepaid stored-value product is being redeemed rather than immediately upon sale of the product. Adoption of this standard did not have a material impact on our consolidated financial statements. All other new pronouncements: In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02, Leases On January 1, 2018, we adopted ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), which amends ASC 230, Statement of Cash Flows , the FASB’s standard for reporting cash flows in general-purpose financial statements. The amendment addresses the diversity in practice related to the classification of certain cash receipts and payments including debt prepayment or debt extinguishment costs. We adopted this guidance using the full retrospective method. Adoption of this guidance did not have a material impact on our consolidated financial statements as we have historically reported debt prepayment and debt extinguishment costs in a manner consistent with ASU 2016-15. On January 1, 2018, we adopted ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which removes the prohibition in ASC 740, Income Taxes , against the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. This is intended to reduce the complexity of GAAP and diversity in practice related to the tax consequences of certain types of intra-entity asset transfers, particularly those involving intellectual property. Adoption of this standard did not have a material impact on our consolidated financial statements. On January 1, 20

Net Loss Per Share

Net Loss Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	3. Net Loss Per Share Basic and diluted net loss per share have been calculated using the weighted-average number of common shares outstanding for the period. The shares of common stock effectively repurchased in connection with the Forward Transactions (as defined and described in Note 7, “Long-Term Debt and Other Liabilities”) are considered participating securities requiring the two-class method to calculate basic and diluted earnings per share. Net earnings in future periods will be allocated between common shares and participating securities. In periods of a net loss, the shares associated with the Forward Transactions will not receive an allocation of losses, as the counterparties to the Forward Transactions are not required to fund losses. Additionally, the calculation of weighted average shares outstanding as of December 31, 2018, 2017 and 2016 excludes approximately 7.2 million shares that will be repurchased as a result of the Forward Transactions. As a result of the net loss for each of the years ended December 31, 2018, 2017 and 2016 for the periods where such shares or securities were outstanding, all of the outstanding shares of common stock underlying stock options, deferred stock units and restricted stock units were excluded from the computation of diluted shares outstanding because they were anti-dilutive. The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016; however, because of the undistributed losses, the shares associated with the Forward Transactions are excluded from the computation of basic earnings per share as undistributed losses are not allocated to these shares ( in thousands, except per share amounts ): For the Years Ended December 31, 2018 2017 2016 Net loss $ (162,031 ) $ (171,995 ) $ (124,505 ) Less: Participation rights of the Forward Transactions — — — Undistributed losses $ (162,031 ) $ (171,995 ) $ (124,505 ) Weighted-average common shares outstanding-basic and diluted 80,038 79,407 78,915 Net loss attributable to common stock per share-basic and diluted $ (2.02 ) $ (2.17 ) $ (1.58 )

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue Recognition	4. Revenue Recognition Remaining Performance Obligations As of December 31, 2018, the aggregate amount of the transaction price in our contracts allocated to the remaining unsatisfied performance obligations is approximately $972 million, most of which relates to our commercial aviation contracts. Approximately $195 million represents future equipment revenue that is expected to be recognized within the next one to three years. The remaining $777 million primarily represents connectivity and entertainment service revenues which are recognized as services are provided, which is expected to occur through the remaining term of the contract (approximately 5-10 years). We have excluded from this amount: all variable consideration derived from our connectivity or entertainment services that is allocated entirely to our performance of obligations related to such services; consideration from contracts that have an original duration of one year or less; revenue from passenger services on airlines operating under the turnkey model; and revenue from contracts that have been executed but have not yet met the accounting definition of a contract since the airline has not yet determined which products in our portfolio it wishes to select, and, as a result, we are unable to determine which products and services will be transferred to the customer. Disaggregation of revenue The following table presents our revenue disaggregated by category (in thousands) : For the Year Ended December 31, 2018 CA-NA CA-ROW BA Total Service revenue Connectivity $ 339,791 $ 63,955 $ 195,022 $ 598,768 Entertainment, CAS and other 27,577 2,447 1,355 31,379 Total service revenue $ 367,368 $ 66,402 $ 196,377 $ 630,147 Equipment revenue ATG (1) $ 53,410 $ — $ 72,159 $ 125,569 Satellite (1) 48,439 67,992 18,165 134,596 Other — — 3,452 3,452 Total equipment revenue $ 101,849 $ 67,992 $ 93,776 $ 263,617 Customer type Airline passenger and aircraft owner/operator $ 216,466 $ 21,738 $ 196,377 $ 434,581 Airline, OEM and aftermarket dealer (2) 196,106 105,026 93,776 394,908 Third party 56,645 7,630 — 64,275 Total revenue $ 469,217 $ 134,394 $ 290,153 $ 893,764 (1) ATG and satellite equipment revenue for the CA-NA segment includes the $45.4 million related to the accounting impact of the transition of one of our airline partners to the airline-directed model. Approximately $43.4 million was included in ATG equipment revenue and approximately $2.0 million was included in satellite equipment revenue. (2) Airline, OEM and aftermarket dealer revenue includes all equipment revenue for our three segments, including the $45.4 million accounting impact of the transition of one of our airline partners to the airline-directed model. Contract balances Our current and non-current deferred revenue balances totaled $60.1 million and $61.1 million as of December 31, 2018 and January 1, 2018, respectively. Deferred revenue includes, among other things, equipment, multi-packs, subscriptions, sponsorship activities and airline-directed connectivity and entertainment services. Our current and non-current contract asset balances totaled $ 59.9 Our STC balances were $16.5 million and $7.6 million as of December 31, 2018 and January 1, 2018, respectively. We recognized $1.0 million of deferred STC costs as part of our engineering, design and development costs in our consolidated statement of operations for the year ended December 31, 2018. As noted above, STC costs for our airline-directed contracts are capitalized and expensed on a straight-line basis over the life of the contract. Impact of adoption of ASC 606 The following table presents the post adoption impact of ASC 606 on our consolidated balance sheet and the statement of operations (in thousands) : As of December 31, 2018 As Reported Impact of ASC 606 Balances Without Adoption of ASC 606 Assets Prepaid expenses and other current assets $ 34,695 $ (12,054 ) $ 22,641 Other non-current assets 84,212 79,123 163,335 Liabilities Current deferred revenue 38,571 28,209 66,780 Other non-current liabilities 80,191 71,247 151,438 Equity Accumulated deficit (1,228,674 ) (24,165 ) (1,252,839 ) For the Year Ended December 31, 2018 Balances Without As Impact of Adoption of Reported ASC 606 ASC 606 Revenue: Service revenue $ 630,147 $ 14,918 $ 645,065 Equipment revenue 263,617 (115,241 ) 148,376 Operating expenses: Cost of equipment revenue 222,244 (94,440 ) 127,804 Engineering, design and development 120,090 2,340 122,430 Net loss (162,031 ) (8,223 ) (170,254 )

Composition of Certain Balance

Composition of Certain Balance Sheet Accounts	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Composition of Certain Balance Sheet Accounts	5. Composition of Certain Balance Sheet Accounts Inventories as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Work-in-process component parts $ 30,340 $ 35,009 Finished goods (1) 162,705 10,534 Total inventory $ 193,045 $ 45,543 (1) The increase in our inventories is primarily due to the allocation of a portion of our uninstalled airborne equipment ( i.e. CA-NA CA-ROW CA-NA CA-ROW Prepaid expenses and other current assets as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Contract assets (1) $ 10,423 $ — Prepaid satellite services 7,755 3,360 Restricted cash 1,535 500 Other 14,982 16,450 Total prepaid expenses and other current assets $ 34,695 $ 20,310 (1) Changes between December 31, 2018 and 2017 are due to the adoption of ASC 606 and additional activity during the year ended December 31, 2018. See Note 4, “Revenue Recognition,” for additional information. Property and equipment as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Office equipment, furniture, fixtures and other $ 52,320 $ 46,445 Leasehold improvements 44,838 42,522 Airborne equipment (1) (2) 642,151 765,652 Network equipment 205,463 199,304 944,772 1,053,923 Accumulated depreciation (432,905 ) (397,885 ) Property and equipment, net $ 511,867 $ 656,038 (1) Changes between December 31, 2018 and 2017 relate to the accounting impact of the transition of one of our airline partner agreements to the airline-directed model and the adoption of ASC 606 (see Note 2, “Summary of Significant Accounting Policies,” for additional information). (2) Changes between December 31, 2018 and 2017 also relate to the allocation of uninstalled airborne equipment to inventory (see inventories above for additional information). Other non-current assets as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Contract assets (1) $ 49,517 $ — Deferred STC costs (1) 16,453 — Deferred cost of equipment revenue (2) — 40,986 Restricted cash 5,426 6,873 Other 12,816 19,248 Total other non-current assets $ 84,212 $ 67,107 (1) Changes between December 31, 2018 and 2017 are primarily due to the adoption of ASC 606 and additional activity during the year. See Note 4, “Revenue Recognition,” for more information. (2) Changes between December 31, 2018 and 2017 are primarily due to the adoption of ASC 606. See Note 2, “Summary of Significant Accounting Policies,” for additional information. Accrued liabilities as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Employee compensation and benefits $ 19,463 $ 25,621 Airborne equipment and installation costs 25,119 44,059 Airline-related accrued liabilities, including revenue share 45,077 30,905 Accrued interest 46,694 47,649 Accrued satellite network costs 19,557 12,667 Warranty reserve 12,291 2,424 Other 44,258 38,490 Total accrued liabilities $ 212,459 $ 201,815 Other non-current liabilities as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Deferred rent $ 35,897 $ 37,354 Deferred revenue (1) 21,482 73,192 Asset retirement obligations 9,696 9,668 Deferred tax liabilities 2,162 5,983 Other 10,954 8,458 Total other non-current liabilities $ 80,191 $ 134,655 (1) Changes between December 31, 2018 and 2017 are primarily due to the adoption of ASC 606. See Note 2, “Summary of Significant Accounting Policies,” for more information. Changes in our warranty reserve, which is included in accrued liabilities, for the years ended December 31, 2018, 2017 and 2016 consist of the following ( in thousands ): Warranty Reserve Balance – January 1, 2017 $ 2,576 Accruals for warranties issued 348 Settlements of warranties (500 ) Balance – December 31, 2017 2,424 Accruals for warranties issued 10,172 Settlements of warranties (305 ) Balance – December 31, 2018 $ 12,291 Changes between December 31, 2018 and 2017 relate to the accounting impact of the transition of one of our airline agreements to the airline-directed model, additional activity under airline-directed models are associated with remediation of quality issues associated with our 2Ku technology. See Note 2, “Summary of Significant Accounting Policies,” for additional information. Changes in our non-current asset retirement obligations for the years ended December 31, 2018 and 2017 consist of the following ( in thousands ): Asset Retirement Obligation Balance – January 1, 2017 $ 8,527 Liabilities incurred (1) 370 Liabilities settled (252 ) Accretion expense 981 Foreign exchange rate adjustments 42 Balance – December 31, 2017 9,668 Liabilities incurred (2) (760 ) Liabilities settled (192 ) Accretion expense 1,035 Foreign exchange rate adjustments (55 ) Balance – December 31, 2018 $ 9,696 (1) Includes $0.2 million related to a change in estimate in the expected cash flows for our estimated liabilities. (2) Includes $0.8 million related to a change in estimate in the expected cash flows for our estimated liabilities.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	6. Intangible Assets Our intangible assets are comprised of indefinite- and finite-lived intangible assets. We own the rights to both 3MHz of ATG spectrum in the nationwide 800 MHz Commercial Air-Ground Radiotelephone band (the “3 MHz FCC License”), which is used in the operation of our ATG network, and the license for 1 MHz of ATG spectrum in the nationwide 800MHz Commercial Air-Ground Radiotelephone band (“1 MHz FCC License”) acquired in the Airfone Acquisition. Together we refer to the 3 MHz FCC License and the 1 MHz FCC License as the “FCC Licenses.” While the FCC Licenses were issued with 10-year terms, such licenses are subject to renewal by the FCC, and renewals of licenses held by others have occurred routinely and at nominal cost. Moreover, we have determined that there are currently no legal, regulatory, contractual, competitive, economic, or other factors that limit the useful life of the FCC Licenses. As a result, the FCC Licenses are treated as indefinite-lived intangible assets which we do not amortize. We reevaluate the useful life of the FCC Licenses each year to determine whether events and circumstances continue to support an indefinite useful life. Our annual impairment assessment of the FCC Licenses for 2018, 2017, and 2016 indicated no impairment. Our software relates to the development of internal use software which is used to run our network and support our service offerings. Software also includes software embedded in the equipment that we sell to our customers. Our goodwill balance, all of which related to our BA segment, was $0.6 million as of December 31, 2018 and 2017. Our intangible assets, other than goodwill, as of December 31, 2018 and 2017 were as follows ( in thousands, except for weighted average remaining useful life ): Weighted As of December 31, 2018 As of December 31, 2017 Average Remaining Useful Life (in years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortized intangible assets: Software 2.3 $ 164,580 $ (116,873 ) $ 47,707 $ 145,063 $ (93,523 ) $ 51,540 Service customer relationships 1.3 8,081 (6,804 ) 1,277 8,081 (5,788 ) 2,293 Other intangible assets 5.7 3,000 (1,396 ) 1,604 1,500 (1,103 ) 397 OEM and dealer relationships 6,724 (6,724 ) — 6,724 (6,724 ) — Total amortized intangible assets 182,385 (131,797 ) 50,588 161,368 (107,138 ) 54,230 Unamortized intangible assets: FCC Licenses 32,283 — 32,283 32,283 — 32,283 Total intangible assets $ 214,668 $ (131,797 ) $ 82,871 $ 193,651 $ (107,138 ) $ 86,513 Amortization expense for the years ended December 31, 2018, 2017 and 2016 was $26.5 million, $24.9 million and $21.6 million, respectively. Amortization expense for each of the next five years and thereafter is estimated to be as follows ( in thousands ): Years ending December 31, Amortization Expense 2019 $ 22,037 2020 $ 14,421 2021 $ 9,598 2022 $ 2,674 2023 $ 999 Thereafter $ 859 Actual future amortization expense could differ from the estimated amount as the result of future investments and other factors.

Long-Term Debt and Other Liabil

Long-Term Debt and Other Liabilities	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt and Other Liabilities	7. Long-Term Debt and Other Liabilities Long-term debt as of December 31, 2018 and December 31, 2017 in thousands ): December 31, 2018 December 31, 2017 Senior Secured Notes $ 702,670 $ 705,520 2022 Convertible Notes 190,083 — 2020 Convertible Notes 149,195 311,544 Total debt 1,041,948 1,017,064 Less deferred financing costs (17,055 ) (16,196 ) Total long-term debt $ 1,024,893 $ 1,000,868 Senior Secured Notes On June 14, 2016 (the “Issue Date”), Gogo Intermediate Holdings LLC (“GIH”) (a wholly owned subsidiary of Gogo Inc.) and Gogo Finance Co. Inc. (a wholly owned subsidiary of GIH) (the “Co-Issuer” and, together with GIH, the “Issuers”), issued $ 525 As noted above, on September 20, 2017, the Issuers, the Guarantors and the Trustee entered into the Supplemental Indenture to (i) increase the amount of additional secured indebtedness under the Credit Facilities (as defined in the Indenture) that may be incurred by the Issuer and its Restricted Subsidiaries (as defined in the Indenture) under the Indenture by $100 million (from $ 75 As of December 31, 2018 and 2017, the outstanding principal amount of the Senior Secured Notes was $690.0 million and $690.0 million, respectively, the unamortized debt premium and Consent Fees were $12.7 million and $15.5 million, respectively, and the net carrying amount was $702.7 million and $705.5 million, respectively. Interest on the Senior Secured Notes accrues at the rate of 12.500% per annum and is payable semi-annually in arrears on January 1 and July 1, which commenced on January 1, 2017 (other than the January 2017 Additional Notes, for which interest payments commenced on July 1, 2017, and the September 2017 Additional Notes, for which interest payments commenced on January 1, 2018). The Senior Secured Notes mature on July 1, 2022. The January 2017 Additional Notes and September 2017 Additional Notes have the same terms as the Original Senior Secured Notes, except with respect to the issue date and issue price, and are treated as a single series for all purposes under the Indenture and the security documents that govern the Senior Secured Notes. We paid approximately $11.4 million, $2.0 million and $2.5 million, respectively, of aggregate origination fees and financing costs related to the issuance of the Original Senior Secured Notes, the January 2017 Additional Notes and the September 2017 Additional Notes, which have been accounted for as deferred financing costs. Additionally, as noted above, we paid approximately $1.4 million of Consent Fees, which partially offset the net carrying value of the Senior Secured Notes. The deferred financing costs on our consolidated balance sheet are being amortized over the contractual term of the Senior Secured Notes using the effective interest method. Total amortization expense was $2.6 million, $2.3 million and $1.0 million, respectively, for the years ended December 31, 2018, 2017 and 2016. As of December 31, 2018 and 2017, the balance of unamortized deferred financing costs related to the Senior Secured Notes was $10.0 million and $12.6 million, respectively, and is included as a reduction to long-term debt in our consolidated balance sheet. See Note 8, “Interest Costs,” for additional information. The Senior Secured Notes are the senior secured indebtedness of the Issuers and are: • effectively senior to all of the Issuers’ existing and future senior unsecured indebtedness and the Issuers’ indebtedness secured on a junior priority basis by the same collateral securing the Senior Secured Notes, if any, in each case to the extent of the value of the collateral securing the Senior Secured Notes; • effectively senior in right of payment to all of the Issuers’ future indebtedness that is subordinated in right of payment to the Senior Secured Notes; • effectively equal in right of payment with the Issuers’ existing and future (i) unsecured indebtedness that is not subordinated in right of payment to the Senior Secured Notes and (ii) indebtedness secured on a junior priority basis by the same collateral securing the Senior Secured Notes, if any, in each case to the extent of any insufficiency in the collateral securing the Senior Secured Notes; • structurally senior to all of our existing and future indebtedness, including our Convertible Notes (as defined below); and • structurally subordinated to all of the indebtedness and other liabilities of any non-Guarantors (other than the Issuers). The Senior Secured Notes are guaranteed, on a senior secured basis, by us and all of GIH’s existing and future domestic restricted subsidiaries (other than the Co-Issuer), subject to certain exceptions. The Issuers’ obligations under the Senior Secured Notes are not guaranteed by Gogo International Holdings LLC, a subsidiary of ours that holds no material assets other than equity interests in our foreign subsidiaries. Each guarantee is a senior secured obligation of such Guarantor and is: • effectively senior to all of such Guarantor’s existing and future senior unsecured indebtedness and such Guarantor’s indebtedness secured on a junior priority basis by the same collateral, if any, securing the guarantee of such Guarantor, in each case to the extent of the value of the collateral securing such guarantee; • effectively senior in right of payment to all of such Guarantor’s future indebtedness that is subordinated in right of payment to such Guarantor’s guarantee; • effectively equal in right of payment with all of such Guarantor’s existing and future (i) unsecured indebtedness that is not subordinated in right of payment to such Guarantor’s guarantee, and (ii) indebtedness secured on a junior priority basis by the same collateral, if any, securing the guarantee of such Guarantor, in each case to the extent of any insufficiency in the collateral securing such guarantee; and • structurally subordinated to all indebtedness and other liabilities of any non-Guarantor subsidiary of such Guarantor (excluding, in the case of our guarantee, the Issuers). The Senior Secured Notes and the related guarantees are secured by first-priority liens, subject to permitted liens, on substantially all of the Issuers’ and the Guarantors’ assets, except for certain excluded assets, including pledged equity interests of the Issuers and all of our existing and future domestic restricted subsidiaries guaranteeing the Senior Secured Notes. The security interests in certain collateral may be released without the consent of holders of the Senior Secured Notes if such collateral is disposed of in a transaction that complies with the Indenture and related security agreements. In addition, under certain circumstances, we and the Guarantors have the right to transfer certain intellectual property assets that on the Issue Date constitute collateral securing the Senior Secured Notes or the guarantees to a restricted subsidiary organized under the laws of Switzerland, resulting in the release of such collateral without consent of the holders of the Senior Secured Notes. On or after July 1, 2019, the Issuers may, at their option, at any time or from time to time, redeem any of the Senior Secured Notes in whole or in part. The Senior Secured Notes will be redeemable at the following redemption prices (expressed in percentages of principal amount), plus accrued and unpaid interest, if any, to (but not including) the redemption date (subject to the right of holders of record on the relevant regular record date on or prior to the redemption date to receive interest due on an interest payment date), if redeemed during the twelve-month period commencing on July 1 of the following years: Redemption Year Price 2019 106.250 % 2020 103.125 % 2021 and thereafter 100.000 % In addition, at any time prior to July 1, 2019, the Issuers may redeem up to 35% of the aggregate principal amount of the Senior Secured Notes with the proceeds of certain equity offerings at a redemption price of 112.500% of the principal amount redeemed, plus accrued and unpaid interest, if any, to (but not including) the date of redemption; provided, however , that Senior Secured Notes representing at least 65% of the principal amount of the Senior Secured Notes remain outstanding immediately after each such redemption. The Issuers may redeem the Senior Secured Notes, in whole or in part, at any time prior to July 1, 2019, at a redemption price equal to 100% of the principal amount of the Senior Secured Notes redeemed plus the make-whole premium set forth in the Indenture as of, and accrued and unpaid interest, if any, to (but not including) the applicable redemption date. The Indenture contains covenants that, among other things, limit the ability of the Issuers and the Subsidiary Guarantors and, in certain circumstances, our ability, to: incur additional indebtedness; pay dividends, redeem stock or make other distributions; make investments; create restrictions on the ability of our restricted subsidiaries to pay dividends to the Issuers or make other intercompany transfers; create liens; transfer or sell assets; merge or consolidate; and enter into certain transactions with the Issuers’ affiliates, including us. Most of these covenants will cease to apply if, and for as long as, the Senior Secured Notes have investment grade ratings from both Moody’s Investment Services, Inc. and Standard & Poor’s. If we or the Issuers undergo specific types of change of control prior to July 1, 2022, GIH is required to make an offer to repurchase for cash all of the Senior Secured Notes at a repurchase price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any, to (but not including) the payment date. The Indenture provides for events of default, which, if any of them occur, would permit or require the principal, premium, if any, and interest on all of the then outstanding Senior Secured Notes issued under the Indenture to be due and payable immediately. As of December 31, 2018, no event of default had occurred. Convertible Notes 2022 Convertible Notes On November 21, 2018, we issued $215.0 million aggregate principal amount of 6.00% Convertible Senior Notes due 2022 (the “2022 Convertible Notes”) in private offerings to qualified institutional buyers, including pursuant to Rule 144A under the Securities Act, and in concurrent private placements. We granted an option to the initial purchasers to purchase up to an additional $32.3 million aggregate principal amount of 2022 Convertible Notes to cover over-allotments, of which $22.8 million was subsequently exercised during December 2018, resulting in a total issuance of $237.8 million aggregate principal amount of 2022 Convertible Notes. The 2022 Convertible Notes mature on May 15, 2022, unless earlier repurchased or converted into shares of our common stock under certain circumstances described below. Upon maturity, we have the option to settle our obligation through cash, shares of common stock, or a combination of cash and shares of common stock. We pay interest on the 2022 Convertible Notes semi-annually in arrears on May 15 and November 15 of each year. Interest payments begin on May 15, 2019. The $237.8 million of proceeds received from the issuance of the 2022 Convertible Notes was initially allocated between long-term debt (the liability component) at $188.7 million and additional paid-in capital (the equity component) at $49.1 million, within the consolidated balance sheet. The fair value of the liability component was measured using rates determined for similar debt instruments without a conversion feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability component from the aggregate face value of the 2022 Convertible Notes. If we or the note holders elect not to settle the debt through conversion, we must settle the 2022 Convertible Notes at face value. Therefore, the liability component will be accreted up to the face value of the 2022 Convertible Notes, which will result in additional non-cash interest expense being recognized in the consolidated statements of operations through the 2022 Convertible Notes maturity date (see Note 8, “Interest Costs,” for additional information). The effective interest rate on the 2022 Convertible Notes, including accretion of the notes to par and debt issuance cost amortization, was approximately 13.6%. The equity component will not be remeasured as long as it continues to meet the conditions for equity classification. As of December 31, 2018, the outstanding principal on the 2022 Convertible Notes was $237.8 million, the unamortized debt discount was $47.7 million and the net carrying amount of the liability component was $190.1 million. We incurred approximately $8.1 million of issuance costs related to the issuance of the 2022 Convertible Notes, of which $6.4 million and $1.7 million were recorded to deferred financing costs and additional paid-in capital, respectively, in proportion to the allocation of the proceeds of the 2022 Convertible Notes. The $6.4 million recorded as deferred financing costs on our consolidated balance sheet is being amortized over the term of the 2022 Convertible Notes using the effective interest method. Total amortization expense of the deferred financing costs was $0.2 million for the year ended December 31, 2018. Amortization expense is included in interest expense in the consolidated statements of operations. As of December 31, 2018, the balance of unamortized deferred financing costs related to the 2022 Convertible Notes was $6.2 million and is included as a reduction to long-term debt in our consolidated balance sheets. See Note 8, “Interest Costs,” for additional information. The 2022 Convertible Notes had an initial conversion rate of 166.6667 common shares per $1,000 principal amount of 2022 Convertible Notes, which is equivalent to an initial conversion price of approximately $6.00 per share of our common stock. Upon conversion, we currently expect to deliver cash up to the principal amount of the 2022 Convertible Notes then outstanding. With respect to any conversion value in excess of the principal amount, we currently expect to deliver shares of our common stock. We may elect to deliver cash in lieu of all or a portion of such shares. The shares of common stock subject to conversion are excluded from diluted earnings per share calculations under the if-converted method as their impact is anti-dilutive. Holders may convert the 2022 Convertible Notes, at their option, in multiples of $1,000 principal amount at any time prior to January 15, 2022, but only in the following circumstances: • during any fiscal quarter beginning after the fiscal quarter ended December 31, 2018, if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during the last 30 consecutive trading days of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2022 Convertible Notes on each applicable trading day; • during the five business day period following any five consecutive trading day period in which the trading price for the 2022 Convertible Notes is less than 98 • upon the occurrence of specified corporate events. None of the above events allowing for conversion prior to January 15, 2022 occurred during the year ended December 31, 2018. Regardless of whether any of the foregoing circumstances occurs, a holder may convert its 2022 Convertible Notes, in multiples of $1,000 principal amount, at any time on or after January 15, 2022 until the second scheduled trading day immediately preceding May 15, 2022. In addition, if we undergo a fundamental change (as defined in the indenture governing the 2022 Convertible Notes), holders may, subject to certain conditions, require us to repurchase their 2022 Convertible Notes for cash at a price equal to 100% of the principal amount of the 2022 Convertible Notes to be purchased, plus any accrued and unpaid interest. In addition, following a make-whole fundamental change, we will increase the conversion rate in certain circumstances for a holder who elects to convert its notes in connection with such make-whole fundamental change. 2020 Convertible Notes On March 3, 2015, we issued $340.0 million aggregate principal amount of 3.75% Convertible Senior Notes due 2020 (the “2020 Convertible Notes”) in a private offering to qualified institutional buyers, pursuant to Rule 144A under the Securities Act. We granted an option to the initial purchasers to purchase up to an additional $60.0 million aggregate principal amount of 2020 Convertible Notes to cover over-allotments, of which $21.9 million was subsequently exercised during March 2015, resulting in a total issuance of $361.9 million aggregate principal amount of 2020 Convertible Notes. The 2020 Convertible Notes mature on March 1, 2020, unless earlier repurchased or converted into shares of our common stock under certain circumstances described below. Upon maturity, we have the option to settle our obligation through cash, shares of common stock, or a combination of cash and shares of common stock. We pay interest on the 2020 Convertible Notes semi-annually in arrears on March 1 and September 1 of each year. Interest payments began on September 1, 2015. During November 2018, we repurchased $199.9 million of outstanding principal amount of the 2020 Convertible Notes. As a result of the repurchase, the carrying value of the 2020 Convertible Notes were accreted up $17.9 million to face value. Additionally, we expensed $1.3 million of unamortized deferred financing costs and paid $0.5 million of fees in connection with the repurchase. These three items comprise the loss on extinguishment of debt of $19.7 million in our consolidated statement of operations. The $361.9 million of proceeds received from the issuance of the 2020 Convertible Notes was initially allocated between long-term debt (the liability component) at $261.9 million and additional paid-in capital (the equity component) at $100.0 million, within the consolidated balance sheet. The fair value of the liability component was measured using rates determined for similar debt instruments without a conversion feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability component from the aggregate face value of the 2020 Convertible Notes. If we or the note holders elect not to settle the debt through conversion, we must settle the 2020 Convertible Notes at face value. Therefore, the liability component will be accreted up to the face value of the 2020 Convertible Notes, which will result in additional non-cash interest expense being recognized in the consolidated statements of operations through the 2020 Convertible Notes maturity date (see Note 8, “Interest Costs,” for additional information). The effective interest rate on the 2020 Convertible Notes, including accretion of the notes to par and debt issuance cost amortization, was approximately 11.5%. The equity component will not be remeasured as long as it continues to meet the conditions for equity classification. As of December 31, 2018 and 2017, the outstanding principal on the 2020 Convertible Notes was $162.0 million and $361.9 million, respectively, the unamortized debt discount was $12.8 million and $50.4 million, respectively, and the net carrying amount of the liability component was $149.2 million and $311.5 million, respectively. We incurred approximately $10.4 million of issuance costs related to the issuance of the 2020 Convertible Notes, of which $7.5 million and $2.9 million were recorded to deferred financing costs and additional paid-in capital, respectively, in proportion to the allocation of the proceeds of the 2020 Convertible Notes. The $7.5 million recorded as deferred financing costs on our consolidated balance sheet is being amortized over the term of the 2020 Convertible Notes using the effective interest method. Total amortization expense of the deferred financing costs was $1.4 million, $1.5 million and $1.4 million, respectively, for the years ended December 31, 2018, 2017 and 2016. Additionally, as noted above, we expensed $1.3 million of unamortized deferred financing fees as a result of the repurchase. Amortization expense is included in interest expense in the consolidated statements of operations. As of December 31, 2018 and 2017, the balance of unamortized deferred financing costs related to the 2020 Convertible Notes was $0.9 million and $3.6 million, respectively, and is included as a reduction to long-term debt in our consolidated balance sheets. See Note 8, “Interest Costs,” for additional information. The 2020 Convertible Notes had an initial conversion rate of 41.9274 common shares per $1,000 principal amount of 2020 Convertible Notes, which is equivalent to an initial conversion price of approximately $23.85 per share of our common stock. Upon conversion, we currently expect to deliver cash up to the principal amount of the 2020 Convertible Notes then outstanding. With respect to any conversion value in excess of the principal amount, we currently expect to deliver shares of our common stock. We may elect to deliver cash in lieu of all or a portion of such shares. The shares of common stock subject to conversion are excluded from diluted earnings per share calculations under the if-converted method as their impact is anti-dilutive. Holders may convert the 2020 Convertible Notes, at their option, in multiples of $1,000 principal amount at any time prior to December 1, 2019, but only in the following circumstances: • during any fiscal quarter beginning after the fiscal quarter ended June 30, 2015, if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during the last 30 consecutive trading days of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2020 Convertible Notes on each applicable trading day; • during the five business day period following any five consecutive trading day period in which the trading price for the 2020 Convertible Notes is less than 98 • upon the occurrence of specified corporate events. None of the above events allowing for conversion prior to December 1, 2019 occurred during the year ended December 31, 2018. Regardless of whether any of the foregoing circumstances occurs, a holder may convert its 2020 Convertible Notes, in multiples of $1,000 principal amount, at any time on or after December 1, 2019 until maturity. In addition, if we undergo a fundamental change (as defined in the indenture governing the 2020 Convertible Notes), holders may, subject to certain conditions, require us to repurchase their 2020 Convertible Notes for cash at a price equal to 100% of the principal amount of the 2020 Convertible Notes to be purchased, plus any accrued and unpaid interest. In addition, if specific corporate events occur prior to the maturity date, we will increase the conversion rate for a holder who elects to convert its 2020 Convertible Notes in connection with such a corporate event in certain circumstances. Forward Transactions In connection with the issuance of the 2020 Convertible Notes, we paid approximately $140 million to enter into prepaid forward stock repurchase transactions (the “Forward Transactions”) with certain financial institutions (the “Forward Counterparties”), pursuant to which we purchased approximately 7.2 million shares of common stock for settlement on or around the March 1, 2020 maturity date for the 2020 Convertible Notes, subject to the ability of each Forward Counterparty to elect to settle all or a portion of its Forward Transactions early. As a result of the Forward Transactions, total shareholders’ equity within our consolidated balance sheet was reduced by approximately $140 million. Approximately 7.2 million shares of common stock that will be effectively repurchased through the Forward Transactions are treated as retired shares for basic and diluted EPS purposes although they remain legally outstanding. Amended and Restated Senior Term Facility On July 30, 2014, GIH, Gogo Business Aviation LLC, f/k/a Aircell Business Aviation Services LLC (“GBA”), and Gogo LLC, as borrowers (collectively, the “Borrowers”), entered into an Amendment and Restatement Agreement (the “Amendment”) to the Credit Agreement dated as of June 21, 2012 and amended on April 4, 2013 (the “Amended Senior Term Facility”) among the Borrowers, the lenders named therein, and Morgan Stanley Senior Funding, Inc., as Administrative Agent and Collateral Agent. We refer to the Amendment and the Amended Senior Term Facility collectively as the “Amended and Restated Senior Term Facility.” On June 14, 2016, the outstanding principal balance of $287.7 million, together with accrued and unpaid interest, was paid in full, and the Amended and Restated Senior Term Facility was terminated in accordance with its terms on such date (subject to the survival of provisions expressly stated therein to survive the termination thereof). Additionally, we paid the voluntary prepayment premium of 3.0%, or $8.6 million, and wrote off all of the remaining unamortized deferred financing costs of $6.8 million. Both of these items are included in loss on extinguishment of debt in our consolidated financial statements. We paid $22.2 million of loan origination fees and financing costs related to the Amended and Restated Senior Term Facility, all but $4.1 million of which were accounted for as deferred financing costs. Total amortization expense of the deferred financing costs was $1.4 million for the year ended December 31, 2016. Amortization expense is included in interest expense in the consolidated statements of operations. As noted above, deferred financing costs related to the Amended and Restated Senior Term Facility were written off as of June 14, 2016. Restricted Cash Our restricted cash balances were $7.0 million and $7.4 million, respectively, as of December 31, 2018 and 2017 and primarily consist of letters of credit. Certain of the letters of credit require us to maintain restricted cash accounts in a similar amount, and are issued for the benefit of the landlords at our current office locations in Chicago, IL, Bensenville, IL and Broomfield, CO.

Interest Costs

Interest Costs	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Interest Costs	8. Interest Costs The following is a summary of our interest costs for the years ended December 31, 2018, 2017 and 2016 (in thousands) : For the Years Ended December 31, 2018 2017 2016 Interest costs charged to expense $ 100,274 $ 89,915 $ 62,348 Amortization of deferred financing costs 4,280 3,743 3,803 Accretion of Convertible Notes 21,105 19,520 17,496 Amortization of debt premium of Senior Secured Notes (2,850 ) (1,234 ) — Interest expense 122,809 111,944 83,647 Interest costs capitalized to property and equipment 32 26 205 Interest costs capitalized to software 364 1,075 1,300 Total interest costs $ 123,205 $ 113,045 $ 85,152 We capitalize a portion of our interest on funds borrowed during the active construction period of major capital projects. Capitalized interest is added to the cost of the underlying assets and amortized over the useful lives of the assets.

Common Stock and Preferred Stoc

Common Stock and Preferred Stock	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Common Stock and Preferred Stock	9. Common Stock and Preferred Stock Common Stock have one class of common stock outstanding as of December 31, 2018 and 2017. Our common stock is junior to our preferred stock, if and when issued. Our Third Amended and Restated Certificate of Incorporation authorizes a total of 500,000,000 shares of common stock with a par value of $0.0001 per share. Our Third Amended and Restated Certificate of Incorporation authorizes 100,000,000 shares of new preferred stock with a par value of $0.01 per share. No shares of this new preferred stock have been issued. The preferred stock may be issued, from time to time, in one or more series as authorized by the Board of Directors, which has the authority to designate the terms of any series of preferred stock issued, including, without limitation, the number of shares to be included in such series of preferred stock, any dividend, redemption, conversion rights or voting powers and the designations, preferences and relative participating, optional or other special rights.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	10. Fair Value of Financial Assets and Liabilities A three-tier fair value hierarchy has been established which prioritizes the inputs used in measuring fair value. These tiers include: • Level 1 - defined as observable inputs such as quoted prices in active markets; • Level 2 - defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and • Level 3 - defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. Long-Term Debt: Our financial assets and liabilities that are disclosed but not measured at fair value include the Senior Secured Notes, the 2022 Convertible Notes and the 2020 Convertible Notes, which are reflected on the consolidated balance sheet at cost. The fair value measurements are classified as Level 2 within the fair value hierarchy since they are based on quoted market prices of our instruments in markets that are not active. We estimated the fair value of the Senior Secured Notes, 2022 Convertible Notes and 2020 Convertible Notes by calculating the upfront cash payment a market participant would require to assume these obligations. The upfront cash payments used in the calculations of fair value on our December 31, 2018 consolidated balance sheet, excluding any issuance costs, is the amount that a market participant would be able to lend at December 31, 2018 to an entity with a credit rating similar to ours and achieve sufficient cash inflows to cover the scheduled cash outflows under the Senior Secured Notes, the 2022 Convertible Notes and the 2020 Convertible Notes. The calculated fair value of our 2022 Convertible Notes and 2020 Convertible Notes is correlated to our stock price and as a result, significant changes to our stock price could have a significant impact on their calculated fair values. The fair value and carrying value of long-term debt as of December 31, 2018 and 2017 was as follows (in thousands) : December 31, 2018 December 31, 2017 Fair Value (1) Carrying Value Fair Value (1) Carrying Value Senior Secured Notes $ 737,000 $ 702,670 (2) $ 782,000 $ 705,520 (2) 2022 Convertible Notes 216,000 190,083 (3) — — 2020 Convertible Notes 150,000 149,195 (4) 330,000 311,544 (4) (1) Fair value amounts are rounded to the nearest million. (2) Carrying value of the Senior Secured Notes includes unamortized debt premium and Consent Fees of $12.7 million and $15.5 million, respectively, as of December 31, 2018 and 2017. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. (3) Carrying value of the 2022 Convertible Notes excludes unamortized debt discount of $47.7 million as of December 31, 2018. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. (4) Carrying value of the 2020 Convertible Notes excludes unamortized debt discount of $12.8 million and $50.4 million, respectively, as of December 31, 2018 and 2017. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. We have held-to-maturity financial instruments where carrying value approximated fair value. There were no fair value adjustments to these financial instruments during the years ended December 31, 2018, 2017 and 2016.

Business Segments and Major Cus

Business Segments and Major Customers	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Business Segments and Major Customers	11. Business Segments and Major Customers We operate our business through three operating segments: Commercial Aviation North America, or “CA-NA,” Commercial Aviation Rest of World, or “CA-ROW” and Business Aviation, or “BA.” CA-NA Segment: Our CA-NA segment provides in-flight connectivity and wireless digital entertainment solutions to commercial airline passengers flying routes that generally begin and end within North America, which for this purpose includes the United States, Canada and Mexico. CA-ROW Segment: Our CA-ROW business provides in-flight connectivity and wireless digital entertainment solutions to passengers flying on foreign-based commercial airlines and flights outside of North America for North American-based commercial airlines. The routes included in our CA-ROW segment are those that begin and/or end outside of North America (as defined above) for which our international service is provided. BA Segment : Our BA business provides equipment for in-flight connectivity along with voice and data services to the business aviation market. BA services include Gogo Biz, our in-flight broadband service that utilizes both our ATG network and our ATG spectrum, Passenger Entertainment, our in-flight entertainment service, and satellite-based voice and data services through strategic alliances with satellite companies. Customers include business aircraft manufacturers, owners, and operators, as well as government and military entities. The accounting policies of the operating segments are the same as those described in Note 2, “Summary of Significant Accounting Policies.” Intercompany transactions between segments are excluded as they are not included in management’s performance review of the segments. Our foreign revenue accounted for less than 15% of our consolidated revenue for the year ended December 31, 2018 and less than 10% for the years ended December 31, 2017 and 2016. We do not segregate assets between segments for internal reporting. Therefore, asset-related information has not been presented. We do not disclose assets outside of the United States as they totaled less than 15% of our consolidated assets as of December 31, 2018 and less than 10% of our consolidated assets as of December 31, 2017. For our airborne assets, we consider only those assets installed in aircraft associated with international commercial airline partners to be owned outside of the United States. Management evaluates performance and allocates resources to each segment based on segment profit (loss), which is calculated internally as net income (loss) attributable to common stock before interest expense, interest income, income taxes, depreciation and amortization, and certain non-cash items (including amortization of deferred airborne lease incentives, stock-based compensation expense, adjustment to deferred financing costs, loss on extinguishment of debt, amortization of STC costs and the accounting impact of the transition to the airline-directed model). Segment profit (loss) is a measure of performance reported to the chief operating decision maker for purposes of making decisions about allocating resources to the segments and evaluating segment performance. In addition, segment profit (loss) is included herein in conformity with ASC 280-10, Segment Reporting . Management believes that segment profit (loss) provides useful information for analyzing and evaluating the underlying operating results of each segment. However, segment profit (loss) should not be considered in isolation or as a substitute for net income (loss) attributable to common stock or other measures of financial performance prepared in accordance with GAAP. Additionally, our computation of segment profit (loss) may not be comparable to other similarly titled measures computed by other companies. Information regarding our reportable segments is as follows ( in thousands ): For the Year Ended December 31, 2018 CA-NA CA-ROW BA Total Service revenue $ 367,368 $ 66,402 $ 196,377 $ 630,147 Equipment revenue (1) 101,849 67,992 93,776 263,617 Total revenue $ 469,217 $ 134,394 $ 290,153 $ 893,764 Segment profit (loss) $ 26,228 $ (94,537 ) $ 139,739 $ 71,430 For the Year Ended December 31, 2017 CA-NA CA-ROW BA Total Service revenue $ 393,484 $ 53,542 $ 170,880 $ 617,906 Equipment revenue 7,129 4,323 69,732 81,184 Total revenue $ 400,613 $ 57,865 $ 240,612 $ 699,090 Segment profit (loss) $ 66,802 $ (106,978 ) $ 99,409 $ 59,233 For the Year Ended December 31, 2016 CA-NA CA-ROW BA Total Service revenue $ 357,250 $ 24,198 $ 132,845 $ 514,293 Equipment revenue 14,273 1,180 66,804 82,257 Total revenue $ 371,523 $ 25,378 $ 199,649 $ 596,550 Segment profit (loss) $ 71,870 $ (87,637 ) $ 82,874 $ 67,107 (1) CA-NA equipment revenue for the year ended December 31, 2018 includes the accounting impact of the transition of one of our airline partners to the airline-directed model. See Note 2, “Summary of Significant Accounting Policies,” for additional information. A reconciliation of segment profit (loss) to the relevant consolidated amounts is as follows ( in thousands ): For the Years Ended December 31, 2018 2017 2016 CA-NA segment profit $ 26,228 $ 66,802 $ 71,870 CA-ROW segment loss (94,537 ) (106,978 ) (87,637 ) BA segment profit 139,739 99,409 82,874 Total segment profit 71,430 59,233 67,107 Interest income 4,292 2,964 1,635 Interest expense (122,809 ) (111,944 ) (83,647 ) Depreciation and amortization (133,617 ) (145,490 ) (105,642 ) Transition to airline-directed model 21,551 — — Amortization of deferred airborne lease incentives (1) 31,650 41,816 29,519 Amortization of STC costs (1,023 ) — — Stock compensation expense (16,912 ) (19,821 ) (17,621 ) Loss on extinguishment of debt (19,653 ) — (15,406 ) Adjustment of deferred financing fees — — 792 Other income (expense) (233 ) (750 ) 72 Loss before income taxes $ (165,324 ) $ (173,992 ) $ (123,191 ) (1) Amortization of deferred airborne lease incentive only relates to our CA-NA and CA-ROW segments. See Note 15, “Leases,” for further information. Major Customers and Airline Partnerships— During the year ended December 31, 2018, American Airlines accounted for approximately 22% of consolidated revenue, while no other customer accounted for more than 10% of consolidated revenue during the prior year periods. Revenue earned from American Airlines for the year ended December 31, 2018 included $45.4 million of equipment revenue recognized due to the airline’s transition to the airline-directed model in January 2018. See Note 2, “Summary of Significant Accounting Policies,” for additional information. Revenue earned from passengers on aircraft operated by American Airlines, which was under the turnkey model during the years ended December 31, 2017 and 2016, accounted for approximately 21% and 23% of consolidated revenue, respectively. Revenue earned from passengers on aircraft operated by Delta Air Lines, which is under the turnkey model, accounted for approximately 23%, 26% and 27% of consolidated revenue, respectively, for the years ended December 31, 2018, 2017 and 2016. American Airlines accounted for approximately 11% of consolidated accounts receivable as of December 31, 2018 and one customer accounted for approximately 15% of consolidated accounts receivable as of December 31, 2017. Delta Air Lines, one of our airline partners, accounted for approximately 11% and 21%, respectively, of consolidated accounts receivable as of December 31, 2018 and 2017.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	12. Stock-Based Compensation As of December 31, 2018, we maintained three stock-based employee compensation plans: the Gogo Inc. 2016 Omnibus Incentive Plan (the “2016 Omnibus Plan”), the Gogo Inc. 2013 Omnibus Incentive Plan (the “2013 Omnibus Plan”), and The Aircell Holdings Inc. Stock Option Plan (the “2010 Plan”), collectively referred to as the “Stock Plans.” Our Stock Plans provide for the grant of both equity and cash awards, including non-qualified Under the Stock Plans, 27,906,570 shares of common stock were reserved for issuance. As of December 31, 2018, 7,841,256 shares remained available for grant under our Stock Plans. The contractual life of granted options is 10 years. All options that are unvested as of the date on which a recipient’s employment terminates, as well as vested options that are not exercised within a prescribed period following termination, are forfeited and become available for future grants. Options granted to date include options that (a) vest 20% upon grant with the remainder vesting in equal annual increments over a four-year period, (b) vest over a four-year period with 25% vesting on the anniversary of each grant date, (c) vest 25% after one year from grant date and in equal monthly increments for the following three years or (d) vest on the date of grant for options granted to non -employee non-market non-market non-market The following is a summary of our stock-based compensation expense included in the consolidated statements of operations for the years December 31, 2018, 2017 and 2016 (in thousands) 2018 2017 2016 Cost of service revenue $ 1,659 $ 1,748 $ 1,499 Cost of equipment revenue 210 185 117 Engineering, design and development 3,347 3,656 3,046 Sales and marketing 4,267 4,751 4,962 General and administrative 7,429 9,481 7,997 Total stock-based compensation expense $ 16,912 $ 19,821 $ 17,621 A summary of stock option activity for the year ended December 31, 2018 is as follows: Number of Weighted Weighted Aggregate (in Options outstanding – January 1, 2018 10,387,376 $ 13.96 6.22 $ 8,924 Granted 2,537,353 $ 9.20 Exercised (2,500 ) $ 8.37 Forfeited (776,246 ) $ 11.19 Expired (1,431,825 ) $ 15.61 Options outstanding – December 31, 2018 10,714,158 $ 12.81 6.25 $ — Options exercisable – December 31, 2018 6,363,744 $ 14.24 4.76 $ — As of December 31, 2018, total unrecognized compensation costs related to unvested stock options were approximately $12 million which is expected to be recognized over a weighted average period of approximately 2.4 years. The total grant date fair value of stock options vested in 2018, 2017 and 2016 was approximately $9 million, $10 million and $9 million, respectively. We estimate the fair value of stock options using the Black-Scholes option-pricing model. Weighted average assumptions used and weighted average grant date fair value of stock options granted for the years ended December 31, 2018, 2017, and 2016 were as follows: 2018 2017 2016 Approximate risk-free interest rate 2.7 % 2.3 % 1.3 % Average expected life (years) 6.03 6.14 6.12 Dividend yield N/A N/A N/A Volatility 49.2 % 45.3 % 45.3 % Weighted average grant date fair value of common stock underlying options granted $ 8.97 $ 11.97 $ 8.72 Weighted average grant date fair value of stock options granted $ 4.42 $ 5.59 $ 3.88 The risk-free interest rate assumptions were based on the U.S. Treasury yield curve for the term that mirrored the expected term in effect at the time of grant. The expected life of our stock options was determined based upon a simplified assumption that the stock options will be exercised evenly from vesting to expiration, as we do not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected life. The dividend yield was based on expected dividends at the time of grant. We have not been a public company long enough to calculate volatility based exclusively on our own common stock. Therefore, the expected volatility is calculated as of each grant date based on a weighting of our own common stock and reported data for a peer group of publicly traded companies for which historical information is available. The following table summarizes the activities for our unvested RSUs and DSUs for the year ended December 31, 2018: Number of Weighted Unvested – January 1, 2018 1,717,857 $ 11.27 Granted 2,747,836 $ 5.11 Vested (653,447 ) $ 11.53 Forfeited/canceled (588,266 ) $ 8.24 Unvested – December 31, 2018 3,223,980 $ 6.51 As of December 31, 2018, there was approximately $15 million of unrecognized compensation cost related to unvested employee RSUs. This amount is expected to be recognized over a weighted-average period of approximately 1.9 years. The total grant date fair value of RSUs and DSUs vested in 2018 was approximately $8 million. The following table summarizes the activity for our restricted stock for the year ended December 31, 2018: Number of Weighted Unvested – January 1, 2018 214,144 $ 13.62 Granted — $ — Vested (93,266 ) $ 15.23 Forfeited/canceled (2,825 ) $ 12.42 Unvested – December 31, 2018 118,053 $ 12.38 As of December 31, 2018, there was approximately $1 million of unrecognized compensation cost related to unvested employee restricted stock. This amount is expected to be recognized over a weighted-average period of approximately 1.9 years. ESPP - pre- specified

Employee Retirement and Postret

Employee Retirement and Postretirement Benefits	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Employee Retirement and Postretirement Benefits	13. Employee Retirement and Postretirement Benefits 401(k) Plan

Income Tax

Income Tax	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax	14. Income Tax For financial reporting purposes, loss before income taxes included the following components for the years ended December 31, 2018, 2017, and 2016 ( in thousands ): For the Years Ended December 31, 2018 2017 2016 United States $ (128,361 ) $ (138,881 ) $ (108,363 ) Foreign (36,963 ) (35,111 ) (14,828 ) Loss before income taxes $ (165,324 ) $ (173,992 ) $ (123,191 ) Significant components of the (benefit) provision for income taxes for the years ended December 31, 2018, 2017, and 2016 are as follows ( in thousands ): For the Years Ended December 31, 2018 2017 2016 Current: Federal $ — $ — $ — State 467 235 451 Foreign 61 49 24 528 284 475 Deferred: Federal (3,908 ) (2,590 ) 764 State 87 309 75 (3,821 ) (2,281 ) 839 Total $ (3,293 ) $ (1,997 ) $ 1,314 The benefit (provision) for income taxes differs from income taxes computed at the federal statutory tax rates for the years ended December 31, 2018, 2017, and 2016 as a result of the following items: For the Years Ended December 31, 2018 2017 2016 Federal statutory rate 21.0 % 35.0 % 35.0 % Effect of: Impact of change in tax rate 0.1 (47.0 ) — Change in valuation allowance (24.8 ) 12.5 (38.5 ) State income taxes-net of federal tax benefit 4.0 2.4 3.8 Other 1.7 (1.8 ) (1.4 ) Effective tax rate 2.0 % 1.1 % (1.1 )% Components of the net deferred income tax asset as of December 31, 2018 and 2017 are as follows ( in thousands ): December 31, December 31, 2018 2017 Deferred income tax assets: Compensation accruals $ 3,407 $ 4,854 Stock options 15,552 13,256 Inventory 1,102 702 Warranty reserves 1,014 605 Deferred rent 9,603 9,868 Deferred revenue 37,501 51,295 Federal net operating loss (NOL) 143,433 129,064 State NOL 24,623 21,122 Interest carryforward 22,029 — UNICAP adjustment 2,311 3,241 Finite-lived intangible assets 7,576 8,756 Other 11,576 7,500 Total deferred income tax assets 279,727 250,263 Deferred income tax liabilities: Fixed assets (53,944 ) (59,885 ) Indefinite-lived intangible assets (6,528 ) (5,983 ) Convertible Notes discount (14,612 ) (12,243 ) Other (2,272 ) (170 ) Total deferred income tax liabilities (77,356 ) (78,281 ) Total deferred income tax 202,371 171,982 Valuation allowance (204,533 ) (177,965 ) Net deferred income tax liability $ (2,162 ) $ (5,983 ) We assess the realizability of the deferred tax assets by considering whether it is more likely than not that some portion or all of the deferred tax assets would not be realized through the generation of future taxable income. We generated net losses in fiscal years 2018, 2017, and 2016, which means we are in a domestic three-year cumulative loss position. As a result of this and other assessments in fiscal year 2018, we concluded that a full valuation allowance is required for all deferred tax assets and liabilities except for deferred tax liabilities associated with indefinite-lived intangible assets. As of December 31, 2018, the federal net operating loss (“NOL”) carryforward amount was approximately $574 million and the state NOL carryforward amount was approximately $419 million. The federal NOLs begin to expire in 2031. The state NOLs expire in various tax years and began to expire in 2016. Utilization of our NOL and tax credit carryforwards may be subject to substantial annual limitations due to the ownership change limitations provided by the Internal Revenue Code and similar state provisions. Such annual limitations could result in the expiration of the NOL and tax credit carryforwards before their utilization. The events that may cause ownership changes include, but are not limited to, a cumulative stock ownership change of greater than 50% over a three-year period. We are subject to taxation in the United States, Canada, Switzerland, Japan, Mexico, Brazil, Singapore, the United Kingdom, Hong Kong, Australia, China, France, Germany, the Netherlands and India. With few exceptions, as of December 31, 2018, we are no longer subject to U.S. federal, state, local or foreign examinations by tax authorities for years before 2015. As a result of the passage of H.R. 1, originally known as the Tax Cuts and Jobs Act (“U.S. Tax Reform”) in December 2017, the tax effected amounts of the deferred tax assets and liabilities decreased. A large portion of this change in the deferred tax balances resulted in an offsetting change to the deferred tax asset valuation allowance and did not affect tax expense. For the deferred tax liabilities that are not offset by changes to the valuation allowance, our net deferred tax liability was reduced by approximately $3 million. As of December 31, 2018, 2017 and 2016, we did not have any unrecognized tax benefits. We record penalties and interest relating to uncertain tax positions in the income tax provision line item in the consolidated statement of operations. No penalties or interest related to uncertain tax positions were recorded for the years ended December 31, 2018, 2017 or 2016. As of December 31, 2018 and 2017, we did not have a liability recorded for interest or potential penalties. We do not expect there will be a change in the unrecognized tax benefits within the next 12 months.

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	15. Leases Arrangements with Commercial Airlines — Pursuant to contractual agreements with our airline partners, we place our equipment on commercial aircraft operated by the airlines for the purpose of delivering our service to passengers on the aircraft. There are currently two types of commercial airline arrangements: turnkey and airline-directed. See Note 2, “Summary of Significant Accounting Policies,” for additional information on airline-directed arrangements. We recognized $31.7 million, $41.8 million, and $29.5 million, respectively, for the years ended December 31, 2018, 2017 and 2016, as a reduction to our cost of service revenue in our consolidated statements of operations. As of December 31, 2018, deferred airborne lease incentives of $24.1 million and $129.1 million, respectively, are included in current and non-current liabilities in our consolidated balance sheet. As of December 31, 2017, deferred airborne lease incentives of $42.1 million and $142.9 million, respectively, are included in current and non-current liabilities in our consolidated balance sheet. The decrease in our deferred airborne lease incentives and the amortization of the deferred airborne lease incentives relate to the accounting impact of the transition of one of our airline agreements to the airline-directed model. See Note 2, “Summary of Significant Accounting Policies,” for additional information. Under the turnkey model, the revenue share paid to our airline partners represents operating lease payments. They are deemed to be contingent rental payments, as the payments due to each airline are based on a percentage of our CA-NA and CA-ROW service revenue generated from that airline’s passengers, which is unknown until realized. Therefore, we cannot estimate the lease payments due to an airline at the commencement of our contract with such airline. This rental expense is included in cost of service revenue and is partially offset by the amortization of the deferred airborne lease incentives discussed above. Such rental expenses totaled a net charge of $24.5 million, $30.5 million, and $41.6 million, respectively, for the years ended December 31, 2018, 2017 and 2016. The decrease in rental expense was due to the transition of one of our airline agreements to the airline-directed model. See Note 2, “Summary of Significant Accounting Policies,” for additional information. Leases and Cell Site Contracts - We have lease agreements relating to certain facilities and equipment, which are considered operating leases. Rent expense for such operating leases was $12.6 million, $12.0 million and $11.8 million, respectively, for the years ended December 31, 2018, 2017 and 2016. Additionally, we have operating leases with wireless service providers for tower space and base station capacity on a volume usage basis (“cell site leases”), some of which provide for minimum annual payments. Our cell site leases generally provide for an initial noncancelable term with various renewal options. Total cell site rental expense was $10.5 million, $9.5 million and $9.4 million, respectively, for the years ended December 31, 2018, 2017 and 2016. Annual future minimum obligations for operating leases for each of the next five years and thereafter, other than the arrangements we have with our commercial airline partners, as of December 31, 2018, are as follows ( in thousands ): Operating Years ending December 31, Leases 2019 $ 21,902 2020 $ 19,867 2021 $ 19,742 2022 $ 18,420 2023 $ 14,826 Thereafter $ 78,100 Equipment Leases – We lease certain computer and network equipment under capital leases, for which interest has been imputed with annual interest rates ranging from approximately 8% to 14%. As of December 31, 2018, the computer equipment leases were classified as part of office equipment, furniture, and fixtures and other in our consolidated balance sheet at a gross cost of $6.3 million. As of December 31, 2018, the network equipment leases were classified as part of network equipment in our consolidated balance sheet at a gross cost of $7.5 million. Annual future minimum obligations under capital leases for each of the next five years and thereafter, as of December 31, 2018, are as follows ( in thousands Capital Years ending December 31, Leases 2019 $ 707 2020 218 Thereafter — Total minimum lease payments 925 Less: Amount representing interest (72 ) Present value of net minimum lease payments $ 853 The $0.9 million present value of net minimum lease payments as of December 31, 2018 has a current portion of $0.7 million included in current portion of long-term debt and capital leases and a non-current portion of $0.2 million included in other non-current liabilities.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. Commitments and Contingencies Contractual Commitments We have agreements with various vendors under which we have remaining commitments to purchase satellite-based systems, certifications and development services. Such commitments will become payable as we receive the equipment or certifications, or as development services are provided. A contract with one of our airline customers required us to provide the airline customer with a cash rebate of $1.8 million in June 2018, which has not yet been paid. Damages and Penalties— Indemnifications and Guarantees In the ordinary course of business we may occasionally enter into agreements pursuant to which we may be obligated to pay for the failure of the performance of others, such as the use of corporate credit cards issued to employees. Based on historical experience, we believe that the risk of sustaining any material loss related to such guarantees is remote. We have entered into a number of agreements, including our agreements with commercial airlines, pursuant to which we indemnify the other party for losses and expenses suffered or incurred in connection with any patent, copyright, or trademark infringement or misappropriation claim asserted by a third party with respect to our equipment or services. The maximum potential amount of future payments we could be required to make under these indemnification agreements is uncertain and is typically not limited by the terms of the agreements. Linksmart Litigation Securities Litigation 10b-5 Derivative Litigation

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Data (Unaudited)	17. Quarterly Data (Unaudited) Summarized quarterly financial information is as follows for each quarterly period for the years ended December 31, 2018 and 2017 ( in thousands, except per share amounts ): For the Three Month Periods Ended Mar 31, 2018 June 30, 2018 Sep 30, 2018 Dec 31, 2018 Total revenue $ 231,825 $ 227,458 $ 217,257 $ 217,224 Operating loss (2,171 ) (7,449 ) (7,610 ) (9,691 ) Net loss (27,419 ) (37,207 ) (37,717 ) (59,688 ) Net loss attributable to common stock (27,419 ) (37,207 ) (37,717 ) (59,688 ) Net loss attributable to common stock per share – basic and diluted $ (0.34 ) $ (0.47 ) $ (0.47 ) $ (0.74 ) Weighted average number of shares – basic and diluted 79,696 79,783 80,196 80,303 For the Three Month Periods Ended Mar 31, 2017 June 30, 2017 Sep 30, 2017 Dec 31, 2017 Total revenue $ 165,406 $ 172,800 $ 172,874 $ 188,010 Operating loss (14,698 ) (17,336 ) (17,801 ) (14,427 ) Net loss (41,367 ) (44,209 ) (45,281 ) (41,138 ) Net loss attributable to common stock (41,367 ) (44,209 ) (45,281 ) (41,138 ) Net loss attributable to common stock per share – basic and diluted $ (0.52 ) $ (0.56 ) $ (0.57 ) $ (0.52 ) Weighted average number of shares – basic and diluted 79,139 79,334 79,543 79,603 Note: The quarterly periods during 2018 reflect the impact of adoption of ASC 606. The historical financial statements have not been restated and are reported under the revenue accounting standard in effect for those periods. See Note 2, “Summary of Significant Accounting Policies – Recently Issued Accounting Pronouncements,” for further information.

Condensed Financial Information

Condensed Financial Information of Registrant	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Information of Registrant	18. Condensed Financial Information of Registrant The following presents the condensed financial information of our parent company on a standalone basis. Gogo Inc. Condensed Balance Sheets (in thousands) December 31, December 31, 2018 2017 Assets: Cash and cash equivalents $ 161,113 $ 9,734 Short-term investments 39,323 192,893 Prepaid expenses and other current assets 738 913 Other non-current assets 101 100 Total assets $ 201,275 $ 203,640 Liabilities and stockholders’ deficit: Total current liabilities $ 3,998 $ 4,847 Long-term debt 332,211 307,968 Other non-current liabilities 2,162 5,983 Investments and payables with subsidiaries 131,665 76,406 Total liabilities 470,036 395,204 Total stockholders’ deficit (268,761 ) (191,564 ) Total liabilities and stockholders’ deficit $ 201,275 $ 203,640 Gogo Inc. Condensed Statements of Operations and Comprehensive Loss (in thousands) For the Years Ended December 31, 2018 2017 2016 Interest income $ (3,123 ) $ (1,681 ) $ (978 ) Interest expense 36,984 34,577 32,461 Loss on extinguishment of debt 19,653 — — Total other (income) expense 53,514 32,896 31,483 Income (loss) before income taxes (53,514 ) (32,896 ) (31,483 ) Income tax provision (benefit) (3,354 ) (2,045 ) 1,276 Equity losses of subsidiaries 111,871 141,144 91,746 Net loss (162,031 ) (171,995 ) (124,505 ) Comprehensive loss $ (162,031 ) $ (171,995 ) $ (124,480 ) Gogo Inc. Condensed Statements of Cash Flows (in thousands) For the Years Ended December 31, 2018 2017 2016 Net loss $ (162,031 ) $ (171,995 ) $ (124,505 ) Accretion of debt discount 21,105 19,520 17,496 Amortization of deferred financing costs 1,648 1,484 1,392 Loss on extinguishment of debt 19,653 — — Subsidiary equity losses 111,871 141,144 91,746 Deferred income taxes (3,821 ) (2,281 ) 839 Other operating activities (674 ) (609 ) (319 ) Net cash used in operating activities (12,249 ) (12,737 ) (13,351 ) Acquisition of short-term investments (39,323 ) (192,893 ) (213,905 ) Redemption of short-term investments 192,893 213,905 179,593 Investments and advances with subsidiaries (19,595 ) 601 (23,312 ) Net cash provided by (used in) investing activities 133,975 21,613 (57,624 ) Financing activities: Proceeds from issuance of convertible notes 237,750 — — Repurchase of convertible notes (200,438 ) — — Payment of debt issuance costs (8,054 ) — — Other financing activities 396 (227 ) 271 Net cash provided by (used in) financing activities 29,654 (227 ) 271 Increase (decrease) in cash, cash equivalents and restricted cash 151,380 8,649 (70,704 ) Cash, cash equivalents and restricted cash at beginning of period 9,834 1,185 71,889 Cash, cash equivalents and restricted cash at end of period $ 161,214 $ 9,834 $ 1,185 Cash, cash equivalents and restricted cash at end of period 161,214 9,834 1,185 Less: current restricted cash — — 114 Less: non-current restricted cash 101 100 — Cash and cash equivalents at end of period $ 161,113 $ 9,734 $ 1,071

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation – The consolidated financial statements include our wholly owned subsidiaries. All intercompany transactions and account balances have been eliminated.
Use of Estimates	Use of Estimates —The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates the significant estimates and bases such estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. However, actual results could differ materially from those estimates.
Reclassifications	Reclassifications - To conform to the current year presentation, certain amounts in our 2017 and 2016 consolidated statements of cash flows have been reclassified. Specifically, for the years ended December 31, 2017 and 2016, current deferred rent of $174 thousand and $73 thousand, respectively, has been combined with accrued liabilities, and non-current deferred rent of $798 thousand and $120 thousand, respectively, has been combined with other non-current assets and liabilities. Additionally, warranty reserves is now separately stated in its own line, which was included in accrued liabilities previously.
Significant Risks and Uncertainties	Significant Risks and Uncertainties —Our operations are subject to certain risks and uncertainties, including without limitation those associated with continuing losses, fluctuations in operating results, funding of business expansion, strategic alliances, capacity constraints, managing rapid growth and expansion, relationships with customers, suppliers and distributors, financing arrangement terms that may restrict operations, regulatory issues, competition, the economy, technology trends and evolving industry standards.
Cash, Cash Equivalents and Short-Term Investments	Cash, Cash Equivalents and Short-Term Investments— We consider cash and cash equivalents to be short-term, highly liquid investments that have the following characteristics: readily convertible to known amounts of cash, so near their maturities that there is insignificant risk of changes in value due to any changes in market interest rates, and having maturities of three months or less when purchased. We continually monitor positions with, and the credit quality of, the financial institutions with which we invest. The carrying amounts reported in the balance sheets for cash and cash equivalents approximate the fair market value of these assets. We consider short-term investments to be investments with maturities of twelve months or less (but greater than three months). Currently all our short-term investments are comprised of U.S. Treasury bills, which we intend to hold to maturity. Certain cash amounts are restricted as to use and are classified outside of cash and cash equivalents. See Note 7, “Long-term Debt and Other Liabilities,” for further details.
Concentrations of Credit Risk	Concentrations of Credit Risk— Financial instruments that potentially subject us to a concentration of credit risk consist principally of cash and cash equivalents, short-term investments and accounts receivable. All cash and cash equivalents are invested with creditworthy financial institutions. We perform ongoing credit evaluations and generally do not require collateral to support receivables. Our short-term investments are all comprised of U.S. Treasury bills. See Note 11, “Business Segments and Major Customers,” for further details.
Income Tax	Income Tax— We use an asset- and liability-based approach in accounting for income taxes. Deferred income tax assets and liabilities are recorded based on the differences between the financial statement and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the tax differences are expected to reverse. Valuation allowances are provided against deferred tax assets which are not likely to be realized. On a regular basis, management evaluates the recoverability of deferred tax assets and the need for a valuation allowance. We also consider the existence of any uncertain tax positions and, as necessary, provide a reserve for any uncertain tax positions at each reporting date. See Note 14, “Income Tax,” for further details.
Inventories	Inventories— Inventories consist primarily of telecommunications systems and parts, and are recorded at the lower of cost (average cost) or market. We evaluate the need for write-downs associated with obsolete, slow-moving and nonsalable inventory by reviewing net realizable inventory values on a periodic basis. Historically, inventories were solely related to the BA segment. Starting in 2018, the airborne equipment within our CA-NA and CA-ROW segments became increasingly deployed under airline-directed model agreements (see “Revenue Recognition,” below for additional details), and we now allocate uninstalled airborne equipment between property and equipment, net, and inventories, based on our forecasts of estimated future installations by contract type. Prior to this allocation, uninstalled airborne equipment for the CA-NA and CA-ROW segments was classified as property and equipment, net, as the majority of installations were performed under our turnkey model agreements. See “Arrangements with Commercial Airlines,” below for additional information on the turnkey model treatment. See Note 5, “Composition of Certain Balance Sheet Accounts,” for further details.
Property and Equipment and Depreciation	Property and Equipment and Depreciation— Depreciation expense totaled $107.1 million, $120.6 million and $84.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. Depreciation of property and equipment is computed using the straight-line method over the estimated useful lives for owned assets, which are as follows: Office equipment, furniture, fixtures and other 3-7 years Leasehold improvements 3-13 years Airborne equipment 7 years Network equipment 5-25 years See Note 5, “Composition of Certain Balance Sheet Accounts,” for further details. Improvements to leased property are amortized over the shorter of the useful life of the improvement or the term of the related lease. Repairs and maintenance costs are expensed as incurred. Due to advances in technology and changes in agreements with our airline partners, with respect to upgrading equipment, we periodically reassess the useful lives of our property and equipment. Such reassessment has resulted in the useful life of specific assets being adjusted to a shorter period than originally estimated, resulting in an increase in annual depreciation expense for those assets.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets— Goodwill and other intangible assets with indefinite lives are not amortized, but are reviewed for impairment at least annually or whenever events or circumstances indicate the carrying value of the asset may not be recoverable. Our FCC Licenses (as defined in Note 6, “Intangible Assets”) are our only indefinite-lived intangible assets. We perform our annual impairment tests of goodwill and our FCC Licenses during the fourth quarter of each fiscal year. We assess qualitative factors to determine the likelihood of impairment. Our qualitative analysis includes, but is not limited to, assessing the changes in macroeconomic conditions, regulatory environment, industry and market conditions, financial performance versus budget and any other events or circumstances specific to goodwill and the FCC Licenses. If it is more likely than not that the fair value of goodwill and the FCC Licenses is greater than the carrying value, no further testing is required. Otherwise, we will apply the quantitative impairment test method. Our quantitative impairment testing of the FCC Licenses uses the Greenfield method, an income-based approach. When performing this quantitative impairment testing, we estimate the fair value of the goodwill and FCC Licenses asset balances based primarily on projected future operating results, discounted cash flows, and other assumptions. Projected future operating results and cash flows used for valuation purposes may reflect considerable improvements relative to historical periods with respect to, among other things, revenue growth and operating margins. Although we believe our projected future operating results and cash flows and related estimates regarding fair values are based on reasonable assumptions, projected operating results and cash flows may not always be achieved. The failure to achieve one or more of our assumptions regarding projected operating results and cash flows in the near term or long term could reduce the estimated fair value below carrying value and result in the recognition of an impairment charge. The results of our annual goodwill and indefinite-lived intangible asset impairment assessments for 2018, 2017 and 2016 indicated no impairment. Intangible assets that are deemed to have a finite life are amortized over their useful lives as follows: Software 3-8 years OEM and dealer relationships 10 years Service customer relationships 5-7 years Other intangible assets 4-10 years See Note 6, “Intangible Assets,” for further details.
Long-Lived Assets	Long-Lived Assets— We review our long-lived assets to determine potential impairment whenever events indicate that the carrying amount of such assets may not be recoverable. We do this by comparing the carrying value of the long-lived assets with the estimated future undiscounted cash flows expected to result from the use of the assets, including cash flows from disposition. If we determine an impairment exists, the asset is written down to estimated fair value. There were no impairments of long-lived assets in 2018, 2017 and 2016.
Arrangements with Commercial Airlines	Arrangements with Commercial Airlines— Pursuant to contractual agreements with our airline partners, we place our equipment on commercial aircraft operated by the airlines for the purpose of delivering our service to passengers on the aircraft. There are currently two types of commercial airline arrangements: turnkey and airline-directed. See “Revenue Recognition,” below for additional information on the airline-directed model. Under the turnkey model, we account for equipment transactions as operating leases of space for our equipment on the aircraft. We may be responsible for the costs of installing and/or deinstalling the equipment. Under the turnkey model, the equipment transactions involve the transfer of legal title but do not meet sales recognition for accounting purposes because the risks and rewards of ownership are not fully transferred due to our continuing involvement with the equipment, the length of the term of our agreements with the airlines, and restrictions in the agreements regarding the airlines’ use of the equipment. Under the this model, we refer to the airline as a “partner.” Under the turnkey model, the assets are recorded as airborne equipment on our consolidated balance sheets, as noted in Note 5, “Composition of Certain Balance Sheet Accounts.” Any upfront equipment payments are accounted for as lease incentives and recorded as deferred airborne lease incentives on our consolidated balance sheets and are recognized as a reduction of the cost of service revenue on the straight-line basis over the term of the agreement with the airline. See Note 15, “Leases,” for further details.
Transition to airline-directed model	Transition to Airline-Directed Model —The accounting treatment for one of our airline agreements transitioned from our turnkey model to our airline-directed model in January 2018 due to specific provisions elected by the airline that resulted in the transfer of control of the previously installed connectivity equipment. Upon transition to the airline-directed model, the net book value of all previously delivered equipment classified within property and equipment was reclassified to cost of equipment revenue. Additionally, the unamortized proceeds previously received for equipment and classified within current and non-current deferred airborne lease incentives were eliminated and included as part of estimated contract value, which was then allocated amongst the various performance obligations under the agreement. The value allocated to previously delivered equipment was immediately recognized as equipment revenue in our consolidated financial statements; see “Revenue Recognition,” below for additional disclosures relating to the allocation of consideration among identified performance obligations. For amounts recognized in equipment revenue that were in excess of the amounts billed, we recorded current and non-current contract assets included within prepaid expenses and other current assets and other non-current assets, respectively; see “Revenue Recognition,” below for additional details. In connection with the transition of this airline agreement to the airline-directed model, we also established warranty reserves related to previously sold equipment that are still under a warranty period, which is included within accrued liabilities. See Note 5, “Composition of Certain Balance Sheet Accounts,” for additional information. This transition from the turnkey model to the airline-directed model occurred on January 4, 2018 and the total financial statement effect on our consolidated balance sheet and consolidated statement of operations was as follows ( in thousands ): Increase (decrease) Consolidated balance sheet Prepaid expense and other current assets $ 6,603 Property and equipment, net (32,716 ) Other non-current assets 18,783 Accrued liabilities 2,000 Current deferred airborne lease incentive (13,592 ) Non-current deferred airborne lease incentive (17,289 ) Consolidated statement of operations Equipment revenue 45,396 Cost of equipment revenue 23,845
Revenue Recognition	Revenue Recognition Our revenue is primarily earned from providing connectivity and entertainment services and through sales of equipment. Additionally, to a lesser extent, we earn revenue from providing ancillary services, including installation and CAS. We determine revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue as we satisfy the performance obligations. For CA-NA and CA-ROW, pursuant to contractual agreements with our airline partners, we place our equipment on commercial aircraft operated by the airlines in order to deliver our service to passengers on the aircraft. We currently have two types of commercial airline arrangements: turnkey and airline-directed. Under the airline-directed model, we have transferred control of the equipment to the airline and therefore the airline is our customer in these transactions. Under the turnkey model, while our airline partner generally has legal title to our equipment, we do not transfer control of our equipment to our airline partner and, as a result, the airline passenger is deemed to be our customer. Transactions with our airline partners under the turnkey model are accounted for as an operating lease of space on an aircraft. See “Arrangements with Commercial Airlines,” above for additional information on the turnkey model. CA-NA and CA-ROW Service Revenue : CA-NA and CA-ROW revenue consists of service revenue primarily derived from connectivity services, and, to a lesser extent, from Entertainment services and CAS. Connectivity is provided to our customers using both our ATG and satellite technologies. Airline-directed connectivity revenue : As noted above, under the airline-directed model, the airline is our customer and we earn service revenue as connectivity services are consumed directly by the airline or indirectly by passengers. Turnkey connectivity revenue (passenger connectivity): Under the turnkey model, passenger connectivity revenue is generated by services paid for by passengers, airlines and third parties. Passenger paid revenue represents point-of-sale sessions (which may be flight-based, time-based, multiple individual session packages (“multi-pack”) or subscriptions). Flight-based, time-based and multi-pack revenue is recognized when the sessions are used. Subscription revenue is recognized evenly throughout the subscription period, regardless of the number of times the customer uses the network. Third party and airline-paid revenue is generated by sales of connectivity services to airlines or third parties in sponsorship, wholesale, enterprise and roaming arrangements. Sponsorship revenue is recognized over the sponsorship term. Revenue from wholesale, enterprise and roaming arrangements is recognized as sessions are used by the passenger. Entertainment revenue: Entertainment revenue consists of entertainment services we provide to the airline for use by its passengers. Revenue is recognized as the services are provided to the airline. CAS: CAS includes, among other things, real-time credit card transaction processing, electronic flight bags and real-time weather information. Revenue is recognized as the service is provided. BA Service Revenue : BA service revenue primarily consists of monthly subscription and usage fees paid by aircraft owners and operators for telecommunication, data, and in-flight entertainment services. Revenue is recognized as the services are provided to the customer. Equipment Revenue : Equipment revenue primarily consists of the sale of ATG and satellite connectivity equipment and the sale of entertainment equipment. CA-NA and CA-ROW recognize equipment revenue upon acceptance by our airline customers. BA recognizes equipment revenue when the equipment is shipped to OEMs and dealers. Equipment revenue also includes revenue generated by the installation of the connectivity or entertainment equipment on commercial aircraft, which is recognized when the installation is complete. Contract price and allocation considerations : Our CA-NA and CA-ROW airline-directed contracts contain multiple performance obligations, which primarily include the sale of equipment, installation services, connectivity services and entertainment services. For these contracts, we account for each distinct good or service as a separate performance obligation. We allocate the contract’s transaction price to each performance obligation using the relative standalone selling price, which is based on the actual selling price for any good or service sold separately to a similar class of customer, if available. To the extent a good or service is not sold separately, we use our best estimate of the standalone selling price and maximize the use of observable inputs. The primary method we use to estimate the standalone selling price is the expected cost-plus margin approach. The contractual consideration used for allocation purposes includes connectivity and entertainment services, which may be based on a fixed monthly fee per aircraft or a variable fee based on the volume of connectivity activity, or a combination of both. Examples of variable consideration within our contracts include megabyte overages and pay-per-use sessions. We constrain our estimates to reduce the probability of a significant revenue reversal in future periods, allocate such variable consideration to the identified performance obligations and recognize revenue in the period the services are provided. Our estimates are based on historical experience, anticipated future performance, market conditions and our best judgment at the time. A significant change in one or more of these estimates could affect our estimated contract value, and we regularly review and update our estimates and recognize adjustments under the cumulative catch-up method. Any adjustment under this method is recorded as a cumulative adjustment in the period identified and revenue for future periods is recognized using the new adjusted estimate.
Research and Development Costs	Research and Development Costs—
Software Development Costs	Software Development Costs— We capitalize costs for network and non-network software developed or obtained for internal use during the application development stage. These costs include purchased software and direct costs associated with the development and configuration of internal use software that supports the operation of our service offerings. These costs are included in goodwill and intangible assets, net in our consolidated balance sheets and, when the software is placed in service, are amortized on a straight-line basis over their estimated useful lives. Costs incurred in the preliminary project and post-implementation stages, as well as maintenance and training costs, are expensed as incurred. With respect to software sold as part of our equipment sales, we capitalize software development costs once technological feasibility has been established. Capitalized software costs are amortized on a product-by-product basis, based on the greater of the ratio that current gross revenues for a product bear to the total of current and anticipated future gross revenues for that product or the straight-line method over the remaining estimated economic life of the product.
Warranty	Warranty— We provide warranties on parts and labor related to our products. Our warranty terms range from two to ten years. Warranty reserves are established for costs that are estimated to be incurred after the sale, delivery and installation of the products under warranty. The warranty reserves are determined based on known product failures, historical experience and other available evidence, and are included in accrued liabilities in our consolidated balance sheets. See Note 5, “Composition of Certain Balance Sheet Accounts,” for the details of the changes in our warranty reserve.
Asset Retirement Obligations	Asset Retirement Obligations— We have certain asset retirement obligations related to contractual commitments to remove our network equipment and other assets from leased cell sites upon termination of the site lease and to remove equipment from aircraft when the service contracts terminate. The asset retirement obligations are classified as a noncurrent liability in our consolidated balance sheets. See Note 5, “Composition of Certain Balance Sheet Accounts,” for the details of the changes in our asset retirement obligations.
Fair Value of Financial Instruments	Fair Value of Financial Instruments— We group financial assets and financial liabilities measured at fair value into three levels of hierarchy based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. See Note 10, “Fair Value of Financial Assets and Liabilities,” for further information.
Derivatives	Derivatives – In March 2015, we entered into a prepaid forward transaction in which we purchased 7.2 million shares of our common stock for approximately $140 million, with an expected settlement date on or around March 1, 2020 Derivatives and Hedging . See Note 7, “Long-Term Debt and Other Liabilities,” Note 9, “Common Stock and Preferred Stock,” and Note 10, “Fair Value of Financial Assets and Liabilities,” for further information.
Convertible Notes	Convertible Notes – Proceeds received from the issuance of 2022 Convertible Notes and 2020 Convertible Notes (as defined in Note 7, “Long-Term Debt and Other Liabilities”) are initially allocated between a liability component (long-term debt) and an equity component (additional paid-in capital), within the consolidated balance sheet. The fair value of the liability component is measured using rates determined for similar debt instruments without a conversion feature. The carrying amount of the equity component, representing the conversion option, is determined by deducting the fair value of the liability component from the aggregate face value of 2022 Convertible Notes and 2020 Convertible Notes. See Note 7, “Long-Term Debt and Other Liabilities,” for further information.
Net Loss Per Share	Net Loss Per Share— We calculate basic and diluted net loss per share using the weighted-average number of common shares outstanding during the period. See Note 3, “Net Loss Per Share,” for further information.
Stock-Based Compensation Expense	Stock-Based Compensation Expense— Compensation cost is measured and recognized at fair value for all stock-based payments, including stock options. For time-based vesting stock options, we estimate fair value using the Black-Scholes option-pricing model, which requires assumptions, such as expected volatility, risk-free interest rate, expected life, and dividends. Restricted stock units (“RSUs”) and restricted stock are measured based on the fair market value of the underlying stock on the date of grant. For awards with a market condition (which we have used on a limited basis), we estimated fair value using the Monte Carlo Simulation model, which requires assumptions, such as volatility, risk-free interest rate, expected life and dividends. Our stock-based compensation expense is recognized over the applicable vesting period, and is included in the same operating expense line items in the consolidated statements of operations as the base cash compensation paid to the underlying employees. See Note 12, “Stock-Based Compensation,” for further information.
Leases	Leases— In addition to our arrangements with commercial airlines which we account for as leases as noted above, we also lease certain facilities, equipment, cell tower space and base station capacity. We review each lease agreement to determine if it qualifies as an operating or capital lease. For leases that contain predetermined fixed escalations of the minimum rent, we recognize the related rent expense on a straight-line basis over the term of the lease. We record any difference between the straight-line rent amounts and amounts payable under the lease as deferred rent, in either accrued liabilities or as a separate line within noncurrent liabilities, as appropriate, in our consolidated balance sheets. For leases that qualify as a capital lease, we record a capital lease asset and a capital lease obligation at the beginning of the lease term at an amount equal to the present value of minimum lease payments during the term of the lease, excluding that portion of the payments that represent executory costs. The capital lease asset is depreciated on a straight-line method over the shorter of its estimated useful life or lease term. See Note 15, “Leases,” for further information.
Advertising Costs	Advertising Costs— Costs for advertising are expensed as incurred.
Debt Issuance Costs	Debt Issuance Costs— We defer loan origination fees and financing costs related to our various debt offerings as deferred financing costs. Additionally, we defer fees paid directly to the lenders related to amendments with our various debt offerings as deferred financing costs. We amortize these costs over the term of the underlying debt obligation using the effective interest method, and include them in interest expense in the consolidated statement of operations. The fees incurred but not paid directly to the lenders in connection with amendments are expensed as incurred to interest expense. Deferred financing costs associated with future debt issuances are written off in the period during which we determine that the debt will no longer be issued. See Note 7, “Long-Term Debt and Other Liabilities” for further information.
Comprehensive Loss	Comprehensive Loss - Comprehensive loss for the years ended December 31, 2018, 2017 and 2016 is net loss plus unrealized gains and losses on foreign currency translation adjustments.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Revenue recognition related new pronouncements: On January 1, 2018, we adopted Accounting Standards Codification Topic 606, Revenue From Contracts With Customers (“ASC 606”) using the modified retrospective method. As a result, we recognized the cumulative effect of initially applying ASC 606 as an adjustment to the opening balance of retained earnings as of January 1, 2018. Our historical financial statements have not been restated and continue to be reported under the revenue accounting standard in effect for those periods. Prior to the adoption of ASC 606, equipment revenue (and related cost) under some of our CA-NA and CA-ROW segment contracts was deferred and recognized over the life of the contract as the equipment and connectivity services did not meet the requirements to be treated as separate units of accounting. Under ASC 606, these same equipment transactions qualify as standalone performance obligations and, therefore, equipment revenue (and related cost) is recognized upon acceptance by our airline customers. Adoption of the new standard did not materially affect the amount or timing of equipment revenue recognized from our BA segment. Our service revenue across all segments continues to be recognized as the services are provided to customers. In conjunction with the adoption of ASC 606, we also adopted Accounting Standard Codification Subtopic 340-40, Other Assets and Deferred Costs – Contracts with Customers (“ASC 340-40”), which requires the capitalization of costs incurred to obtain or fulfill a contract with a customer. Prior to the adoption of ASC 340-40, we expensed all fulfillment and other costs associated with airline-directed contracts, which were comprised predominantly of costs incurred to obtain supplemental type certificates (“STCs”); these costs are now required to be capitalized and amortized to expense over the life of the contract (and are included within engineering, design and development in our consolidated financial statements). Costs associated with our turnkey contracts are not eligible for capitalization under ASC 340-40 and will continue to be expensed as incurred. The cumulative effect of the adoption of ASC 606 and ASC 340-40 to our consolidated balance sheet as of January 1, 2018 was as follows ( in thousands) : Balances Balance at with December 31, Impact of Adoption of 2017 ASC 606 ASC 606 Assets Inventories $ 45,543 $ 974 $ 46,517 Prepaid expenses and other current assets 20,310 603 20,913 Property and equipment, net 656,038 (4,405 ) 651,633 Other non-current assets 67,107 (30,006 ) 37,101 Liabilities Current deferred revenue 43,448 (7,182 ) 36,266 Other non-current liabilities 134,655 (48,378 ) 86,277 Equity Accumulated deficit (1,089,369 ) 22,726 (1,066,643 ) During the fourth quarter 2018, we identified an additional $0.9 million of property and equipment, net that should have been included in the transition adjustments as of January 1, 2018. The schedule above reflects the additional adjustment. See Note 4, “Revenue Recognition,” for additional information. On January 1, 2018, we adopted ASU 2016-04, Recognition of Breakage for Certain Prepaid Stored-Value Products (“ASU 2016-04”), which amends the guidance on extinguishing financial liabilities for certain prepaid stored-value products by requiring that entities that sell prepaid stored-value products recognize breakage proportionally as the prepaid stored-value product is being redeemed rather than immediately upon sale of the product. Adoption of this standard did not have a material impact on our consolidated financial statements. All other new pronouncements: In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-02, Leases On January 1, 2018, we adopted ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), which amends ASC 230, Statement of Cash Flows , the FASB’s standard for reporting cash flows in general-purpose financial statements. The amendment addresses the diversity in practice related to the classification of certain cash receipts and payments including debt prepayment or debt extinguishment costs. We adopted this guidance using the full retrospective method. Adoption of this guidance did not have a material impact on our consolidated financial statements as we have historically reported debt prepayment and debt extinguishment costs in a manner consistent with ASU 2016-15. On January 1, 2018, we adopted ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”), which removes the prohibition in ASC 740, Income Taxes , against the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. This is intended to reduce the complexity of GAAP and diversity in practice related to the tax consequences of certain types of intra-entity asset transfers, particularly those involving intellectual property. Adoption of this standard did not have a material impact on our consolidated financial statements. On January 1, 2018, we adopted ASU 2016-18, Restricted Cash – A Consensus of the FASB Emerging Issues Task Force (“ASU 2016-18”), which amends ASC 230, Statement of Cash Flows , to clarify guidance on the classification and presentation of restricted cash in the statement of cash flows using the full retrospective method. Adoption of this standard did not have a material impact on our consolidated financial statements. See our consolidated statements of cash flows for the reconciliation of cash presented in the statements of cash flows to the cash presented on the balance sheet. On January 1, 2018, we adopted ASU 2017-09, Scope of Modification Accounting (“ASU 2017-09”), which amends the scope of modification accounting for share-based payment arrangements. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, Compensation – Stock Compensation . Specifically, an entity would not apply modification accounting if the fair value, vesting conditions, and classification of the awards are the same immediately before and after the modification. Adoption of this standard did not have a material impact on our consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”) , which permits entities to reclassify tax effects stranded in accumulated other comprehensive income as a result of tax reform to retained earnings. Companies that elect to reclassify these amounts must reclassify stranded tax effects for all items accounted for in accumulated other comprehensive income. ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. We are currently assessing the impact of ASU 2018-02 on our consolidated financial statements and related disclosures. In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting (“ASU 2018-07”), which expands the scope of ASC 718, Compensation – Stock Compensation In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Depreciation of Property and Equipment Estimated Useful Lives	Depreciation of property and equipment is computed using the straight-line method over the estimated useful lives for owned assets, which are as follows: Office equipment, furniture, fixtures and other 3-7 years Leasehold improvements 3-13 years Airborne equipment 7 years Network equipment 5-25 years
Finite Lived Intangible Asset Useful Life	Intangible assets that are deemed to have a finite life are amortized over their useful lives as follows: Software 3-8 years OEM and dealer relationships 10 years Service customer relationships 5-7 years Other intangible assets 4-10 years
Summary of Financial Effects Due to Transition of Agreements	the total financial statement effect on our consolidated balance sheet and consolidated statement of operations was as follows ( in thousands ): Increase (decrease) Consolidated balance sheet Prepaid expense and other current assets $ 6,603 Property and equipment, net (32,716 ) Other non-current assets 18,783 Accrued liabilities 2,000 Current deferred airborne lease incentive (13,592 ) Non-current deferred airborne lease incentive (17,289 ) Consolidated statement of operations Equipment revenue 45,396 Cost of equipment revenue 23,845
Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets	The cumulative effect of the adoption of ASC 606 and ASC 340-40 to our consolidated balance sheet as of January 1, 2018 was as follows ( in thousands) : Balances Balance at with December 31, Impact of Adoption of 2017 ASC 606 ASC 606 Assets Inventories $ 45,543 $ 974 $ 46,517 Prepaid expenses and other current assets 20,310 603 20,913 Property and equipment, net 656,038 (4,405 ) 651,633 Other non-current assets 67,107 (30,006 ) 37,101 Liabilities Current deferred revenue 43,448 (7,182 ) 36,266 Other non-current liabilities 134,655 (48,378 ) 86,277 Equity Accumulated deficit (1,089,369 ) 22,726 (1,066,643 )

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016; however, because of the undistributed losses, the shares associated with the Forward Transactions are excluded from the computation of basic earnings per share as undistributed losses are not allocated to these shares ( in thousands, except per share amounts ): For the Years Ended December 31, 2018 2017 2016 Net loss $ (162,031 ) $ (171,995 ) $ (124,505 ) Less: Participation rights of the Forward Transactions — — — Undistributed losses $ (162,031 ) $ (171,995 ) $ (124,505 ) Weighted-average common shares outstanding-basic and diluted 80,038 79,407 78,915 Net loss attributable to common stock per share-basic and diluted $ (2.02 ) $ (2.17 ) $ (1.58 )

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2018
Summary of Revenue Disaggregated by Category	The following table presents our revenue disaggregated by category (in thousands) : For the Year Ended December 31, 2018 CA-NA CA-ROW BA Total Service revenue Connectivity $ 339,791 $ 63,955 $ 195,022 $ 598,768 Entertainment, CAS and other 27,577 2,447 1,355 31,379 Total service revenue $ 367,368 $ 66,402 $ 196,377 $ 630,147 Equipment revenue ATG (1) $ 53,410 $ — $ 72,159 $ 125,569 Satellite (1) 48,439 67,992 18,165 134,596 Other — — 3,452 3,452 Total equipment revenue $ 101,849 $ 67,992 $ 93,776 $ 263,617 Customer type Airline passenger and aircraft owner/operator $ 216,466 $ 21,738 $ 196,377 $ 434,581 Airline, OEM and aftermarket dealer (2) 196,106 105,026 93,776 394,908 Third party 56,645 7,630 — 64,275 Total revenue $ 469,217 $ 134,394 $ 290,153 $ 893,764 (1) ATG and satellite equipment revenue for the CA-NA segment includes the $45.4 million related to the accounting impact of the transition of one of our airline partners to the airline-directed model. Approximately $43.4 million was included in ATG equipment revenue and approximately $2.0 million was included in satellite equipment revenue. (2) Airline, OEM and aftermarket dealer revenue includes all equipment revenue for our three segments, including the $45.4 million accounting impact of the transition of one of our airline partners to the airline-directed model.
Accounting Standards Update 2014-09 [Member]
Summary of Post Adoption Impact of ASC 606 on Unaudited Condensed Consolidated Balance Sheet and Statement of Operations	The following table presents the post adoption impact of ASC 606 on our consolidated balance sheet and the statement of operations (in thousands) : As of December 31, 2018 As Reported Impact of ASC 606 Balances Without Adoption of ASC 606 Assets Prepaid expenses and other current assets $ 34,695 $ (12,054 ) $ 22,641 Other non-current assets 84,212 79,123 163,335 Liabilities Current deferred revenue 38,571 28,209 66,780 Other non-current liabilities 80,191 71,247 151,438 Equity Accumulated deficit (1,228,674 ) (24,165 ) (1,252,839 ) For the Year Ended December 31, 2018 Balances Without As Impact of Adoption of Reported ASC 606 ASC 606 Revenue: Service revenue $ 630,147 $ 14,918 $ 645,065 Equipment revenue 263,617 (115,241 ) 148,376 Operating expenses: Cost of equipment revenue 222,244 (94,440 ) 127,804 Engineering, design and development 120,090 2,340 122,430 Net loss (162,031 ) (8,223 ) (170,254 )

Composition of Certain Balanc_2

Composition of Certain Balance Sheet Accounts (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Inventories	Inventories as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Work-in-process component parts $ 30,340 $ 35,009 Finished goods (1) 162,705 10,534 Total inventory $ 193,045 $ 45,543
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Contract assets (1) $ 10,423 $ — Prepaid satellite services 7,755 3,360 Restricted cash 1,535 500 Other 14,982 16,450 Total prepaid expenses and other current assets $ 34,695 $ 20,310
Property and Equipment	Property and equipment as of December 31, 2018 and 2017 were as follows ( in thousands ): December 31, 2018 2017 Office equipment, furniture, fixtures and other $ 52,320 $ 46,445 Leasehold improvements 44,838 42,522 Airborne equipment (1) (2) 642,151 765,652 Network equipment 205,463 199,304 944,772 1,053,923 Accumulated depreciation (432,905 ) (397,885 ) Property and equipment, net $ 511,867 $ 656,038
Schedule of Other Non-Current Assets	Other non-current assets as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Contract assets (1) $ 49,517 $ — Deferred STC costs (1) 16,453 — Deferred cost of equipment revenue (2) — 40,986 Restricted cash 5,426 6,873 Other 12,816 19,248 Total other non-current assets $ 84,212 $ 67,107
Accrued Liabilities	Accrued liabilities as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Employee compensation and benefits $ 19,463 $ 25,621 Airborne equipment and installation costs 25,119 44,059 Airline-related accrued liabilities, including revenue share 45,077 30,905 Accrued interest 46,694 47,649 Accrued satellite network costs 19,557 12,667 Warranty reserve 12,291 2,424 Other 44,258 38,490 Total accrued liabilities $ 212,459 $ 201,815
Other Non-Current Liabilities	Other non-current liabilities as of December 31, 2018 and 2017 consist of the following ( in thousands ): December 31, 2018 2017 Deferred rent $ 35,897 $ 37,354 Deferred revenue (1) 21,482 73,192 Asset retirement obligations 9,696 9,668 Deferred tax liabilities 2,162 5,983 Other 10,954 8,458 Total other non-current liabilities $ 80,191 $ 134,655
Schedule of Changes in Warranty Reserves	Changes in our warranty reserve, which is included in accrued liabilities, for the years ended December 31, 2018, 2017 and 2016 consist of the following ( in thousands ): Warranty Reserve Balance – January 1, 2017 $ 2,576 Accruals for warranties issued 348 Settlements of warranties (500 ) Balance – December 31, 2017 2,424 Accruals for warranties issued 10,172 Settlements of warranties (305 ) Balance – December 31, 2018 $ 12,291
Schedule of Changes in Non Current Asset Retirement Obligation	Changes in our non-current asset retirement obligations for the years ended December 31, 2018 and 2017 consist of the following ( in thousands ): Asset Retirement Obligation Balance – January 1, 2017 $ 8,527 Liabilities incurred (1) 370 Liabilities settled (252 ) Accretion expense 981 Foreign exchange rate adjustments 42 Balance – December 31, 2017 9,668 Liabilities incurred (2) (760 ) Liabilities settled (192 ) Accretion expense 1,035 Foreign exchange rate adjustments (55 ) Balance – December 31, 2018 $ 9,696

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Other than Goodwill	Our intangible assets, other than goodwill, as of December 31, 2018 and 2017 were as follows ( in thousands, except for weighted average remaining useful life ): Weighted As of December 31, 2018 As of December 31, 2017 Average Remaining Useful Life (in years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Amortized intangible assets: Software 2.3 $ 164,580 $ (116,873 ) $ 47,707 $ 145,063 $ (93,523 ) $ 51,540 Service customer relationships 1.3 8,081 (6,804 ) 1,277 8,081 (5,788 ) 2,293 Other intangible assets 5.7 3,000 (1,396 ) 1,604 1,500 (1,103 ) 397 OEM and dealer relationships 6,724 (6,724 ) — 6,724 (6,724 ) — Total amortized intangible assets 182,385 (131,797 ) 50,588 161,368 (107,138 ) 54,230 Unamortized intangible assets: FCC Licenses 32,283 — 32,283 32,283 — 32,283 Total intangible assets $ 214,668 $ (131,797 ) $ 82,871 $ 193,651 $ (107,138 ) $ 86,513
Summary of Amortization Expenses	Amortization expense for each of the next five years and thereafter is estimated to be as follows ( in thousands ): Years ending December 31, Amortization Expense 2019 $ 22,037 2020 $ 14,421 2021 $ 9,598 2022 $ 2,674 2023 $ 999 Thereafter $ 859

Long-Term Debt and Other Liab_2

Long-Term Debt and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	Long-term debt as of December 31, 2018 and December 31, 2017 in thousands ): December 31, 2018 December 31, 2017 Senior Secured Notes $ 702,670 $ 705,520 2022 Convertible Notes 190,083 — 2020 Convertible Notes 149,195 311,544 Total debt 1,041,948 1,017,064 Less deferred financing costs (17,055 ) (16,196 ) Total long-term debt $ 1,024,893 $ 1,000,868
Summary of Redemption Prices Plus Accrued and Unpaid Interest	The Senior Secured Notes will be redeemable at the following redemption prices (expressed in percentages of principal amount), plus accrued and unpaid interest, if any, to (but not including) the redemption date (subject to the right of holders of record on the relevant regular record date on or prior to the redemption date to receive interest due on an interest payment date), if redeemed during the twelve-month period commencing on July 1 of the following years: Redemption Year Price 2019 106.250 % 2020 103.125 % 2021 and thereafter 100.000 %

Interest Costs (Tables)

Interest Costs (Tables)	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Summary of Interest Costs	The following is a summary of our interest costs for the years ended December 31, 2018, 2017 and 2016 (in thousands) : For the Years Ended December 31, 2018 2017 2016 Interest costs charged to expense $ 100,274 $ 89,915 $ 62,348 Amortization of deferred financing costs 4,280 3,743 3,803 Accretion of Convertible Notes 21,105 19,520 17,496 Amortization of debt premium of Senior Secured Notes (2,850 ) (1,234 ) — Interest expense 122,809 111,944 83,647 Interest costs capitalized to property and equipment 32 26 205 Interest costs capitalized to software 364 1,075 1,300 Total interest costs $ 123,205 $ 113,045 $ 85,152

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Fair Value and Carrying Value of Long-Term Debt	The fair value and carrying value of long-term debt as of December 31, 2018 and 2017 was as follows (in thousands) : December 31, 2018 December 31, 2017 Fair Value (1) Carrying Value Fair Value (1) Carrying Value Senior Secured Notes $ 737,000 $ 702,670 (2) $ 782,000 $ 705,520 (2) 2022 Convertible Notes 216,000 190,083 (3) — — 2020 Convertible Notes 150,000 149,195 (4) 330,000 311,544 (4) (1) Fair value amounts are rounded to the nearest million. (2) Carrying value of the Senior Secured Notes includes unamortized debt premium and Consent Fees of $12.7 million and $15.5 million, respectively, as of December 31, 2018 and 2017. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. (3) Carrying value of the 2022 Convertible Notes excludes unamortized debt discount of $47.7 million as of December 31, 2018. See Note 7, “Long-Term Debt and Other Liabilities,” for further information. (4) Carrying value of the 2020 Convertible Notes excludes unamortized debt discount of $12.8 million and $50.4 million, respectively, as of December 31, 2018 and 2017. See Note 7, “Long-Term Debt and Other Liabilities,” for further information.

Business Segments and Major C_2

Business Segments and Major Customers (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Summary of Reportable Segments	Information regarding our reportable segments is as follows ( in thousands ): For the Year Ended December 31, 2018 CA-NA CA-ROW BA Total Service revenue $ 367,368 $ 66,402 $ 196,377 $ 630,147 Equipment revenue (1) 101,849 67,992 93,776 263,617 Total revenue $ 469,217 $ 134,394 $ 290,153 $ 893,764 Segment profit (loss) $ 26,228 $ (94,537 ) $ 139,739 $ 71,430 For the Year Ended December 31, 2017 CA-NA CA-ROW BA Total Service revenue $ 393,484 $ 53,542 $ 170,880 $ 617,906 Equipment revenue 7,129 4,323 69,732 81,184 Total revenue $ 400,613 $ 57,865 $ 240,612 $ 699,090 Segment profit (loss) $ 66,802 $ (106,978 ) $ 99,409 $ 59,233 For the Year Ended December 31, 2016 CA-NA CA-ROW BA Total Service revenue $ 357,250 $ 24,198 $ 132,845 $ 514,293 Equipment revenue 14,273 1,180 66,804 82,257 Total revenue $ 371,523 $ 25,378 $ 199,649 $ 596,550 Segment profit (loss) $ 71,870 $ (87,637 ) $ 82,874 $ 67,107 (1) CA-NA equipment revenue for the year ended December 31, 2018 includes the accounting impact of the transition of one of our airline partners to the airline-directed model. See Note 2, “Summary of Significant Accounting Policies,” for additional information.
Reconciliation of Segment Profit (loss)	A reconciliation of segment profit (loss) to the relevant consolidated amounts is as follows ( in thousands ): For the Years Ended December 31, 2018 2017 2016 CA-NA segment profit $ 26,228 $ 66,802 $ 71,870 CA-ROW segment loss (94,537 ) (106,978 ) (87,637 ) BA segment profit 139,739 99,409 82,874 Total segment profit 71,430 59,233 67,107 Interest income 4,292 2,964 1,635 Interest expense (122,809 ) (111,944 ) (83,647 ) Depreciation and amortization (133,617 ) (145,490 ) (105,642 ) Transition to airline-directed model 21,551 — — Amortization of deferred airborne lease incentives (1) 31,650 41,816 29,519 Amortization of STC costs (1,023 ) — — Stock compensation expense (16,912 ) (19,821 ) (17,621 ) Loss on extinguishment of debt (19,653 ) — (15,406 ) Adjustment of deferred financing fees — — 792 Other income (expense) (233 ) (750 ) 72 Loss before income taxes $ (165,324 ) $ (173,992 ) $ (123,191 ) (1) Amortization of deferred airborne lease incentive only relates to our CA-NA and CA-ROW segments. See Note 15, “Leases,” for further information.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Summary of Stock-Based Compensation Expense	The following is a summary of our stock-based compensation expense included in the consolidated statements of operations for the years December 31, 2018, 2017 and 2016 (in thousands) : 2018 2017 2016 Cost of service revenue $ 1,659 $ 1,748 $ 1,499 Cost of equipment revenue 210 185 117 Engineering, design and development 3,347 3,656 3,046 Sales and marketing 4,267 4,751 4,962 General and administrative 7,429 9,481 7,997 Total stock-based compensation expense $ 16,912 $ 19,821 $ 17,621
Summary of Stock Options Activity	A summary of stock option activity for the year ended December 31, 2018 is as follows: Number of Options Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Aggregate Intrinsic Value (in thousands) Options outstanding – January 1, 2018 10,387,376 $ 13.96 6.22 $ 8,924 Granted 2,537,353 $ 9.20 Exercised (2,500 ) $ 8.37 Forfeited (776,246 ) $ 11.19 Expired (1,431,825 ) $ 15.61 Options outstanding – December 31, 2018 10,714,158 $ 12.81 6.25 $ — Options exercisable – December 31, 2018 6,363,744 $ 14.24 4.76 $ —
Schedule of Weighted Average Assumptions Used and Weighted Average Grant Date Fair Value of Stock Options	We estimate the fair value of stock options using the Black-Scholes option-pricing model. Weighted average assumptions used and weighted average grant date fair value of stock options granted for the years ended December 31, 2018, 2017, and 2016 were as follows: 2018 2017 2016 Approximate risk-free interest rate 2.7 % 2.3 % 1.3 % Average expected life (years) 6.03 6.14 6.12 Dividend yield N/A N/A N/A Volatility 49.2 % 45.3 % 45.3 % Weighted average grant date fair value of common stock underlying options granted $ 8.97 $ 11.97 $ 8.72 Weighted average grant date fair value of stock options granted $ 4.42 $ 5.59 $ 3.88
Restricted Stock Units And Deferred Stock Units [Member]
Summarizes the Activities for Unvested RSUs and DSUs	The following table summarizes the activities for our unvested RSUs and DSUs for the year ended December 31, 2018: Number of Underlying Shares Weighted Average Grant Date Fair Value Unvested – January 1, 2018 1,717,857 $ 11.27 Granted 2,747,836 $ 5.11 Vested (653,447 ) $ 11.53 Forfeited/canceled (588,266 ) $ 8.24 Unvested – December 31, 2018 3,223,980 $ 6.51
Restricted Stock [Member]
Summarizes the Activities for Unvested RSUs and DSUs	The following table summarizes the activity for our restricted stock for the year ended December 31, 2018: Number of Underlying Shares Weighted Average Grant Date Fair Value Unvested – January 1, 2018 214,144 $ 13.62 Granted — $ — Vested (93,266 ) $ 15.23 Forfeited/canceled (2,825 ) $ 12.42 Unvested – December 31, 2018 118,053 $ 12.38

Income Tax (Tables)

Income Tax (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Loss Before Income Taxes	For financial reporting purposes, loss before income taxes included the following components for the years ended December 31, 2018, 2017, and 2016 ( in thousands ): For the Years Ended December 31, 2018 2017 2016 United States $ (128,361 ) $ (138,881 ) $ (108,363 ) Foreign (36,963 ) (35,111 ) (14,828 ) Loss before income taxes $ (165,324 ) $ (173,992 ) $ (123,191 )
Components of (Benefit) Provision for Income Taxes	Significant components of the (benefit) provision for income taxes for the years ended December 31, 2018, 2017, and 2016 are as follows ( in thousands ): For the Years Ended December 31, 2018 2017 2016 Current: Federal $ — $ — $ — State 467 235 451 Foreign 61 49 24 528 284 475 Deferred: Federal (3,908 ) (2,590 ) 764 State 87 309 75 (3,821 ) (2,281 ) 839 Total $ (3,293 ) $ (1,997 ) $ 1,314
Income Tax Computed at Federal Statutory Tax Rates	The benefit (provision) for income taxes differs from income taxes computed at the federal statutory tax rates for the years ended December 31, 2018, 2017, and 2016 as a result of the following items: For the Years Ended December 31, 2018 2017 2016 Federal statutory rate 21.0 % 35.0 % 35.0 % Effect of: Impact of change in tax rate 0.1 (47.0 ) — Change in valuation allowance (24.8 ) 12.5 (38.5 ) State income taxes-net of federal tax benefit 4.0 2.4 3.8 Other 1.7 (1.8 ) (1.4 ) Effective tax rate 2.0 % 1.1 % (1.1 )%
Components of Deferred Income Tax Assets and Liabilities	Components of the net deferred income tax asset as of December 31, 2018 and 2017 are as follows ( in thousands ): December 31, December 31, 2018 2017 Deferred income tax assets: Compensation accruals $ 3,407 $ 4,854 Stock options 15,552 13,256 Inventory 1,102 702 Warranty reserves 1,014 605 Deferred rent 9,603 9,868 Deferred revenue 37,501 51,295 Federal net operating loss (NOL) 143,433 129,064 State NOL 24,623 21,122 Interest carryforward 22,029 — UNICAP adjustment 2,311 3,241 Finite-lived intangible assets 7,576 8,756 Other 11,576 7,500 Total deferred income tax assets 279,727 250,263 Deferred income tax liabilities: Fixed assets (53,944 ) (59,885 ) Indefinite-lived intangible assets (6,528 ) (5,983 ) Convertible Notes discount (14,612 ) (12,243 ) Other (2,272 ) (170 ) Total deferred income tax liabilities (77,356 ) (78,281 ) Total deferred income tax 202,371 171,982 Valuation allowance (204,533 ) (177,965 ) Net deferred income tax liability $ (2,162 ) $ (5,983 )

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Annual Future Minimum Obligations for Operating Leases Other than Arrangements with Commercial Airline Partners	Annual future minimum obligations for operating leases for each of the next five years and thereafter, other than the arrangements we have with our commercial airline partners, as of December 31, 2018, are as follows ( in thousands ): Operating Years ending December 31, Leases 2019 $ 21,902 2020 $ 19,867 2021 $ 19,742 2022 $ 18,420 2023 $ 14,826 Thereafter $ 78,100
Annual Future Minimum Obligations under Capital Leases	Annual future minimum obligations under capital leases for each of the next five years and thereafter, as of December 31, 2018, are as follows ( in thousands Capital Years ending December 31, Leases 2019 $ 707 2020 218 Thereafter — Total minimum lease payments 925 Less: Amount representing interest (72 ) Present value of net minimum lease payments $ 853

Quarterly Data (Unaudited) (Tab

Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summarized Quarterly Financial Information	Summarized quarterly financial information is as follows for each quarterly period for the years ended December 31, 2018 and 2017 ( in thousands, except per share amounts ): For the Three Month Periods Ended Mar 31, 2018 June 30, 2018 Sep 30, 2018 Dec 31, 2018 Total revenue $ 231,825 $ 227,458 $ 217,257 $ 217,224 Operating loss (2,171 ) (7,449 ) (7,610 ) (9,691 ) Net loss (27,419 ) (37,207 ) (37,717 ) (59,688 ) Net loss attributable to common stock (27,419 ) (37,207 ) (37,717 ) (59,688 ) Net loss attributable to common stock per share – basic and diluted $ (0.34 ) $ (0.47 ) $ (0.47 ) $ (0.74 ) Weighted average number of shares – basic and diluted 79,696 79,783 80,196 80,303 For the Three Month Periods Ended Mar 31, 2017 June 30, 2017 Sep 30, 2017 Dec 31, 2017 Total revenue $ 165,406 $ 172,800 $ 172,874 $ 188,010 Operating loss (14,698 ) (17,336 ) (17,801 ) (14,427 ) Net loss (41,367 ) (44,209 ) (45,281 ) (41,138 ) Net loss attributable to common stock (41,367 ) (44,209 ) (45,281 ) (41,138 ) Net loss attributable to common stock per share – basic and diluted $ (0.52 ) $ (0.56 ) $ (0.57 ) $ (0.52 ) Weighted average number of shares – basic and diluted 79,139 79,334 79,543 79,603

Condensed Financial Informati_2

Condensed Financial Information of Registrant (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Balance Sheets	Gogo Inc. Condensed Balance Sheets (in thousands) December 31, December 31, 2018 2017 Assets: Cash and cash equivalents $ 161,113 $ 9,734 Short-term investments 39,323 192,893 Prepaid expenses and other current assets 738 913 Other non-current assets 101 100 Total assets $ 201,275 $ 203,640 Liabilities and stockholders’ deficit: Total current liabilities $ 3,998 $ 4,847 Long-term debt 332,211 307,968 Other non-current liabilities 2,162 5,983 Investments and payables with subsidiaries 131,665 76,406 Total liabilities 470,036 395,204 Total stockholders’ deficit (268,761 ) (191,564 ) Total liabilities and stockholders’ deficit $ 201,275 $ 203,640
Condensed Statements of Operations and Comprehensive Loss	Gogo Inc. Condensed Statements of Operations and Comprehensive Loss (in thousands) For the Years Ended December 31, 2018 2017 2016 Interest income $ (3,123 ) $ (1,681 ) $ (978 ) Interest expense 36,984 34,577 32,461 Loss on extinguishment of debt 19,653 — — Total other (income) expense 53,514 32,896 31,483 Income (loss) before income taxes (53,514 ) (32,896 ) (31,483 ) Income tax provision (benefit) (3,354 ) (2,045 ) 1,276 Equity losses of subsidiaries 111,871 141,144 91,746 Net loss (162,031 ) (171,995 ) (124,505 ) Comprehensive loss $ (162,031 ) $ (171,995 ) $ (124,480 )
Condensed Statements of Cash Flows	Gogo Inc. Condensed Statements of Cash Flows (in thousands) For the Years Ended December 31, 2018 2017 2016 Net loss $ (162,031 ) $ (171,995 ) $ (124,505 ) Accretion of debt discount 21,105 19,520 17,496 Amortization of deferred financing costs 1,648 1,484 1,392 Loss on extinguishment of debt 19,653 — — Subsidiary equity losses 111,871 141,144 91,746 Deferred income taxes (3,821 ) (2,281 ) 839 Other operating activities (674 ) (609 ) (319 ) Net cash used in operating activities (12,249 ) (12,737 ) (13,351 ) Acquisition of short-term investments (39,323 ) (192,893 ) (213,905 ) Redemption of short-term investments 192,893 213,905 179,593 Investments and advances with subsidiaries (19,595 ) 601 (23,312 ) Net cash provided by (used in) investing activities 133,975 21,613 (57,624 ) Financing activities: Proceeds from issuance of convertible notes 237,750 — — Repurchase of convertible notes (200,438 ) — — Payment of debt issuance costs (8,054 ) — — Other financing activities 396 (227 ) 271 Net cash provided by (used in) financing activities 29,654 (227 ) 271 Increase (decrease) in cash, cash equivalents and restricted cash 151,380 8,649 (70,704 ) Cash, cash equivalents and restricted cash at beginning of period 9,834 1,185 71,889 Cash, cash equivalents and restricted cash at end of period $ 161,214 $ 9,834 $ 1,185 Cash, cash equivalents and restricted cash at end of period 161,214 9,834 1,185 Less: current restricted cash — — 114 Less: non-current restricted cash 101 100 — Cash and cash equivalents at end of period $ 161,113 $ 9,734 $ 1,071

Background - Additional Informa

Background - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	3

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions	Mar. 03, 2015	Mar. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Depreciation expense			$ 107,100,000	$ 120,600,000	$ 84,100,000
Impairment charges			0	0	0
Impairments of long-lived assets			0	0	0
Research and development expense			$ 72,700,000	$ 78,100,000	$ 45,900,000
Forward stock repurchase transaction, shares			7.2	7.2	7.2
Forward stock repurchase transactions amount	$ 140,000,000
Non-current deferred rent			$ 35,897,000	$ 37,354,000
Property and equipment, net			$ 511,867,000	656,038,000
Reclassifications [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Current deferred rent				174,000	$ 73,000
Non-current deferred rent				$ 798,000	$ 120,000
3.75% Convertible Senior Notes [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Forward stock repurchase transaction, shares		7.2
Forward stock repurchase transactions amount		$ 140,000,000
Forward stock repurchase transaction, settlement date		Mar. 1, 2020
Minimum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Warranty term			2 years
Maximum [Member]
Schedule Of Summary Of Significant Accounting Policies [Line Items]
Warranty term			10 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Depreciation of Property and Equipment Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2018
Office Equipment, Furniture, Fixtures and Other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	3 years
Office Equipment, Furniture, Fixtures and Other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	13 years
Airborne Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	7 years
Network Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	5 years
Network Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	25 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Finite Lived Intangible Asset Useful Life (Detail)	12 Months Ended
	Dec. 31, 2018
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	2 years 3 months 18 days
Software [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	3 years
Software [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	8 years
OEM and Dealer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	10 years
Service Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	1 year 3 months 18 days
Service Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	5 years
Service Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	7 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	5 years 8 months 12 days
Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	4 years
Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	10 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Summary of Financial Effects Due to Transition of Agreements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Prepaid expenses and other current assets	$ 34,695				$ 20,310				$ 34,695	$ 20,310
Property and equipment, net	(511,867)				(656,038)				(511,867)	(656,038)
Other non-current assets	84,212				67,107				84,212	67,107
Accrued liabilities	212,459				201,815				212,459	201,815
Current deferred airborne lease incentive	24,145				42,096				24,145	42,096
Non-current deferred airborne lease incentive	129,086				142,938				129,086	142,938
Equipment revenue	217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	893,764	699,090	$ 596,550
Cost of equipment revenue									222,244	$ 58,554	$ 48,650
Transition Agreements To Airline-directed Model [Member]
Prepaid expenses and other current assets	6,603								6,603
Property and equipment, net	(32,716)								(32,716)
Other non-current assets	18,783								18,783
Accrued liabilities	2,000								2,000
Current deferred airborne lease incentive	(13,592)								(13,592)
Non-current deferred airborne lease incentive	$ (17,289)								(17,289)
Equipment revenue									45,396
Cost of equipment revenue									$ 23,845

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Summary of Cumulative Effect of Adoption on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Inventories	$ 193,045	$ 45,543
Prepaid expenses and other current assets	34,695	20,310
Property and equipment, net	511,867	656,038
Other non-current assets	84,212	67,107
Liabilities
Current deferred revenue	38,571	43,448
Other non-current liabilities	80,191	134,655
Equity
Accumulated deficit	$ (1,228,674)	(1,089,369)
Accounting Standards Update 2014-09 And 340-40 [Member]
Assets
Inventories		46,517
Prepaid expenses and other current assets		20,913
Property and equipment, net		651,633
Other non-current assets		37,101
Liabilities
Current deferred revenue		36,266
Other non-current liabilities		86,277
Equity
Accumulated deficit		(1,066,643)
Accounting Standards Update 2014-09 And 340-40 [Member] | Difference between Guidance in Effect Before and after Topic 606 and ASC 34040 [Member]
Assets
Inventories		974
Prepaid expenses and other current assets		603
Property and equipment, net		(4,405)
Other non-current assets		(30,006)
Liabilities
Current deferred revenue		(7,182)
Other non-current liabilities		(48,378)
Equity
Accumulated deficit		$ 22,726

Net Loss Per Share - Additional

Net Loss Per Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Forward stock repurchase transaction shares, excluded from dilution effect	7.2	7.2	7.2

Net Loss Per Share - Computatio

Net Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	$ (162,031)	$ (171,995)	$ (124,505)
Less: Participation rights of the Forward Transactions									0	0	0
Undistributed losses	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	$ (162,031)	$ (171,995)	$ (124,505)
Weighted-average common shares outstanding-basic and diluted	80,303	80,196	79,783	79,696	79,603	79,543	79,334	79,139	80,038	79,407	78,915
Net loss attributable to common stock per share-basic and diluted	$ (0.74)	$ (0.47)	$ (0.47)	$ (0.34)	$ (0.52)	$ (0.57)	$ (0.56)	$ (0.52)	$ (2.02)	$ (2.17)	$ (1.58)

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue from Contracts with Customers [Line Items]
Transaction price allocated to remaining performance obligations	$ 972
Service revenue occurring period	1 year
Future equipment revenue recognition period	Next one to three years
Future Equipment Revenue [Member]
Revenue from Contracts with Customers [Line Items]
Equipment revenue	$ 195
Connectivity and Entertainment Service Revenues [Member]
Revenue from Contracts with Customers [Line Items]
Transaction price allocated to remaining performance obligations	777
Airline [Member]
Revenue from Contracts with Customers [Line Items]
Contract assets, current and non-current	59.9	$ 5.1
Accounting Standards Update 2014-09 [Member]
Revenue from Contracts with Customers [Line Items]
Deferred revenue, current and non-current	60.1	61.1
Deferred STC costs	16.5	$ 7.6	$ 16.5
Accounting Standards Update 2014-09 [Member] | Engineering, Design and Development [Member]
Revenue from Contracts with Customers [Line Items]
Deferred STC costs recognized	$ 1

Revenue Recognition - Summary o

Revenue Recognition - Summary of Revenue Disaggregated by Category (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Disaggregation of revenue	$ 217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	$ 893,764	$ 699,090	$ 596,550
Airline Passenger and Aircraft Owner/Operator [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									434,581
Airline, OEM and Aftermarket Dealer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									394,908
Third Party [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									64,275
Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									630,147
Service Revenue [Member] | Connectivity [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									598,768
Service Revenue [Member] | Entertainment, CAS and Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									31,379
Equipment Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									263,617
Equipment Revenue [Member] | ATG [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									125,569
Equipment Revenue [Member] | Satellite [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									134,596
Equipment Revenue [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									3,452
CA-NA [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									469,217	400,613	371,523
CA-NA [Member] | Airline Passenger and Aircraft Owner/Operator [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									216,466
CA-NA [Member] | Airline, OEM and Aftermarket Dealer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									196,106
CA-NA [Member] | Third Party [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									56,645
CA-NA [Member] | Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									367,368
CA-NA [Member] | Service Revenue [Member] | Connectivity [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									339,791
CA-NA [Member] | Service Revenue [Member] | Entertainment, CAS and Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									27,577
CA-NA [Member] | Equipment Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									101,849
CA-NA [Member] | Equipment Revenue [Member] | ATG [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									53,410
CA-NA [Member] | Equipment Revenue [Member] | Satellite [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									48,439
CA-ROW [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									134,394	57,865	25,378
CA-ROW [Member] | Airline Passenger and Aircraft Owner/Operator [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									21,738
CA-ROW [Member] | Airline, OEM and Aftermarket Dealer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									105,026
CA-ROW [Member] | Third Party [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									7,630
CA-ROW [Member] | Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									66,402
CA-ROW [Member] | Service Revenue [Member] | Connectivity [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									63,955
CA-ROW [Member] | Service Revenue [Member] | Entertainment, CAS and Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									2,447
CA-ROW [Member] | Equipment Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									67,992
CA-ROW [Member] | Equipment Revenue [Member] | Satellite [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									67,992
BA [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									290,153	$ 240,612	$ 199,649
BA [Member] | Airline Passenger and Aircraft Owner/Operator [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									196,377
BA [Member] | Airline, OEM and Aftermarket Dealer [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									93,776
BA [Member] | Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									196,377
BA [Member] | Service Revenue [Member] | Connectivity [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									195,022
BA [Member] | Service Revenue [Member] | Entertainment, CAS and Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									1,355
BA [Member] | Equipment Revenue [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									93,776
BA [Member] | Equipment Revenue [Member] | ATG [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									72,159
BA [Member] | Equipment Revenue [Member] | Satellite [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									18,165
BA [Member] | Equipment Revenue [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of revenue									$ 3,452

Revenue Recognition - Summary_2

Revenue Recognition - Summary of Revenue Disaggregated by Category (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)Segment
Disaggregation of Revenue [Line Items]
Number of operating segments | Segment	3
ATG [Member] | CA-NA [Member]
Disaggregation of Revenue [Line Items]
Equipment revenue	$ 43.4
Satellite [Member] | CA-NA [Member]
Disaggregation of Revenue [Line Items]
Equipment revenue	2
Airline, OEM and Aftermarket Dealer [Member] | Product [Member] | Transition Agreements To Airline-directed Model [Member] | CA-NA [Member]
Disaggregation of Revenue [Line Items]
Equipment revenue	45.4
Airline Partners [Member] | Product [Member] | Transition Agreements To Airline-directed Model [Member] | CA-NA [Member]
Disaggregation of Revenue [Line Items]
Equipment revenue	$ 45.4

Revenue Recognition - Summary_3

Revenue Recognition - Summary of the Post Adoption Impact of ASC 606 - Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Prepaid expenses and other current assets	$ 34,695	$ 20,310
Other non-current assets	84,212	67,107
Liabilities
Current deferred revenue	38,571	43,448
Other non-current liabilities	80,191	134,655
Equity
Accumulated deficit	(1,228,674)	$ (1,089,369)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets
Prepaid expenses and other current assets	(12,054)
Other non-current assets	79,123
Liabilities
Current deferred revenue	28,209
Other non-current liabilities	71,247
Equity
Accumulated deficit	(24,165)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | As Reported [Member]
Assets
Prepaid expenses and other current assets	22,641
Other non-current assets	163,335
Liabilities
Current deferred revenue	66,780
Other non-current liabilities	151,438
Equity
Accumulated deficit	$ (1,252,839)

Revenue Recognition - Summary_4

Revenue Recognition - Summary of the Post Adoption Impact of ASC 606 - Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Total revenue	$ 217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	$ 893,764	$ 699,090	$ 596,550
Operating expenses:
Cost of equipment revenue									222,244	58,554	48,650
Engineering, design and development									120,090	133,286	96,713
Net loss	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	(162,031)	(171,995)	(124,505)
Service [Member]
Revenue:
Total revenue									630,147	617,906	514,293
Product [Member]
Revenue:
Total revenue									263,617	$ 81,184	$ 82,257
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Operating expenses:
Cost of equipment revenue									(94,440)
Engineering, design and development									2,340
Net loss									(8,223)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member]
Revenue:
Total revenue									14,918
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Product [Member]
Revenue:
Total revenue									(115,241)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Operating expenses:
Cost of equipment revenue									127,804
Engineering, design and development									122,430
Net loss									(170,254)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member]
Revenue:
Total revenue									645,065
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Product [Member]
Revenue:
Total revenue									$ 148,376

Composition of Certain Balanc_3

Composition of Certain Balance Sheet Accounts - Components of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Work-in-process component parts	$ 30,340	$ 35,009
Finished goods	162,705	10,534
Total inventory	$ 193,045	$ 45,543

Composition of Certain Balanc_4

Composition of Certain Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Prepaid Expense and Other Assets [Abstract]
Contract assets	$ 10,423
Prepaid satellite services	7,755	$ 3,360
Restricted cash	1,535	500
Other	14,982	16,450
Total prepaid expenses and other current assets	$ 34,695	$ 20,310

Composition of Certain Balanc_5

Composition of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 944,772	$ 1,053,923
Accumulated depreciation	(432,905)	(397,885)
Property and equipment, net	511,867	656,038
Office Equipment, Furniture, Fixtures and Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	52,320	46,445
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,838	42,522
Airborne Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	642,151	765,652
Network Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 205,463	$ 199,304

Composition of Certain Balanc_6

Composition of Certain Balance Sheet Accounts - Schedule of Other Non-Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Contract assets	$ 49,517
Deferred STC costs	16,453
Deferred cost of equipment revenue		$ 40,986
Restricted cash	5,426	6,873
Other	12,816	19,248
Total other non-current assets	$ 84,212	$ 67,107

Composition of Certain Balanc_7

Composition of Certain Balance Sheet Accounts - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Employee compensation and benefits	$ 19,463	$ 25,621
Airborne equipment and installation costs	25,119	44,059
Airline-related accrued liabilities, including revenue share	45,077	30,905
Accrued interest	46,694	47,649
Accrued satellite network costs	19,557	12,667
Warranty reserve	12,291	2,424	$ 2,576
Other	44,258	38,490
Total accrued liabilities	$ 212,459	$ 201,815

Composition of Certain Balanc_8

Composition of Certain Balance Sheet Accounts - Other Non-Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]
Deferred revenue	$ 21,482	$ 73,192
Deferred rent	35,897	37,354
Asset retirement obligations	9,696	9,668	$ 8,527
Deferred tax liabilities	2,162	5,983
Other	10,954	8,458
Total other non-current liabilities	$ 80,191	$ 134,655

Composition of Certain Balanc_9

Composition of Certain Balance Sheet Accounts - Schedule of Changes in Warranty Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Guarantees [Abstract]
Warranty Beginning Balance	$ 2,424	$ 2,576
Accruals for warranties issued	10,172	348
Settlements of warranties	(305)	(500)
Warranty Ending Balance	$ 12,291	$ 2,424

Composition of Certain Balan_10

Composition of Certain Balance Sheet Accounts - Schedule of Changes in Non Current Asset Retirement Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligation, Beginning Balance	$ 9,668	$ 8,527
Liabilities incurred	(760)	370
Liabilities settled	(192)	(252)
Accretion expense	1,035	981
Foreign exchange rate adjustments	(55)	42
Asset retirement obligation, Ending Balance	$ 9,696	$ 9,668

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 0.6	$ 0.6
Amortization expense	$ 26.5	$ 24.9	$ 21.6

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets Net Excluding Goodwill [Line Items]
Total intangible assets, Gross Carrying Amount	$ 214,668	$ 193,651
Amortized intangible assets, Gross Carrying Amount	182,385	161,368
Amortized intangible assets, Accumulated Amortization	(131,797)	(107,138)
Amortized intangible assets, Net Carrying Amount	50,588	54,230
Total intangible assets, Net Carrying Amount	82,871	86,513
FCC Licenses [Member]
Intangible Assets Net Excluding Goodwill [Line Items]
Total unamortized intangible assets, Gross Carrying Amount	32,283	32,283
Total unamortized intangible assets, Net Carrying Amount	$ 32,283	32,283
Software [Member]
Intangible Assets Net Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 3 months 18 days
Amortized intangible assets, Gross Carrying Amount	$ 164,580	145,063
Amortized intangible assets, Accumulated Amortization	(116,873)	(93,523)
Amortized intangible assets, Net Carrying Amount	47,707	51,540
OEM and Dealer Relationships [Member]
Intangible Assets Net Excluding Goodwill [Line Items]
Amortized intangible assets, Gross Carrying Amount	6,724	6,724
Amortized intangible assets, Accumulated Amortization	$ (6,724)	(6,724)
Service Customer Relationships [Member]
Intangible Assets Net Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	1 year 3 months 18 days
Amortized intangible assets, Gross Carrying Amount	$ 8,081	8,081
Amortized intangible assets, Accumulated Amortization	(6,804)	(5,788)
Amortized intangible assets, Net Carrying Amount	$ 1,277	2,293
Other Intangible Assets [Member]
Intangible Assets Net Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	5 years 8 months 12 days
Amortized intangible assets, Gross Carrying Amount	$ 3,000	1,500
Amortized intangible assets, Accumulated Amortization	(1,396)	(1,103)
Amortized intangible assets, Net Carrying Amount	$ 1,604	$ 397

Intangible Assets - Summary of

Intangible Assets - Summary of Amortization Expenses (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,019	$ 22,037
2,020	14,421
2,021	9,598
2,022	2,674
2,023	999
Thereafter	$ 859

Long-Term Debt and Other Liab_3

Long-Term Debt and Other Liabilities - Additional Information (Detail) $ / shares in Units, shares in Millions	Jan. 03, 2017USD ($)	Jun. 14, 2016USD ($)	Mar. 03, 2015USD ($)$ / sharesshares	Nov. 30, 2018USD ($)	Nov. 21, 2018USD ($)$ / shares	Sep. 25, 2017USD ($)	Sep. 20, 2017USD ($)	Mar. 31, 2015shares	Dec. 31, 2018USD ($)Tradingdayshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares	Sep. 19, 2017USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of debt										$ 181,754,000	$ 525,000,000
Total debt									1,041,948,000	1,017,064,000
Amortization of deferred financing costs									4,280,000	3,743,000	$ 3,803,000
Additional paid-in-capital									963,458,000	$ 898,729,000
Proceeds received from the issuance of the convertible notes									$ 237,750,000
Forward stock repurchase transactions amount			$ 140,000,000
Forward stock repurchase transaction, shares | shares									7.2	7.2	7.2
Repayment of convertible notes									$ 200,438,000
Loss on Early repayment of debt									(19,653,000)		$ (15,406,000)
Letters of Credit [Member]
Debt Instrument [Line Items]
Restricted cash									$ 7,000,000	7,400,000
Convertible Notes [Member]
Debt Instrument [Line Items]
Forward stock repurchase transaction, shares | shares			7.2
Forward stock repurchase transaction, settlement date			Mar. 1, 2020
12.500% Senior Secured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 525,000,000
Interest rate		12.50%							12.50%
Unamortized debt premium and consent fees									$ 12,700,000	15,500,000
Interest rate payable term									semi-annually
Loan origination fees									$ 11,400,000
Amortization of deferred financing costs									2,600,000	2,300,000	1,000,000
Debt issuance costs									$ 10,000,000	12,600,000
12.500% Senior Secured Notes Due 2022 [Member] | Condition One [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage of principal amount redeemed									35.00%
Debt instrument redemption price, percentage									112.50%
Outstanding redemption percentage									65.00%
12.500% Senior Secured Notes Due 2022 [Member] | Condition Two [Member]
Debt Instrument [Line Items]
Debt instrument redemption price, percentage		100.00%
12.500% Senior Secured Notes Due 2022 [Member] | Condition Three [Member]
Debt Instrument [Line Items]
Debt instrument redemption price, percentage		101.00%
12.500% Senior Secured Notes Due 2022 [Member] | Additional Notes [Member] | January Two Thousand And Seventeen Additional Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 65,000,000
Interest rate	12.50%
Issue price as percentage of face value	108.00%
Proceeds from issuance of debt	$ 70,200,000
Loan origination fees									$ 2,000,000
12.500% Senior Secured Notes Due 2022 [Member] | Additional Notes [Member] | September Two Thousand And Seventeen Additional Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 100,000,000
Interest rate						12.50%
Issue price as percentage of face value						113.00%
Proceeds from issuance of debt						$ 113,000,000
Accrued interest received						$ 2,900,000
Loan origination fees									$ 2,500,000
12.500% Senior Secured Notes Due 2022 [Member] | Supplemental Indenture [Member]
Debt Instrument [Line Items]
Aggregate principal amount							$ 175,000,000					$ 75,000,000
Increase in debt amount							100,000,000
Additional secured indebtedness							50,000,000
Additional dividends							15,000,000
Consent fees paid							$ 1,400,000
3.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount			$ 361,900,000
Interest rate			3.75%
Interest rate payable term									Semi-annually
Amortization of deferred financing costs									$ 1,400,000	1,500,000	$ 1,400,000
Debt issuance costs									900,000	3,600,000
Debt instrument redemption price, percentage			100.00%
Option granted to initial purchasers			$ 60,000,000
Additional paid-in-capital			100,000,000
Convertible Notes, carrying amount of liability component			261,900,000						$ 149,195,000	311,544,000
Effective interest rate on convertible notes									11.50%
Proceeds received from the issuance of the convertible notes			$ 361,900,000						$ 162,000,000	361,900,000
Convertible Notes, unamortized discount				$ 1,300,000					12,800,000	50,400,000
Conversion rate			41.9274
Principal amount			$ 1,000
Conversion price | $ / shares			$ 23.85
Multiples of principal amount			$ 1,000
Forward stock repurchase transactions amount			140,000,000
Forward stock repurchase transaction, shares | shares								7.2
Forward stock repurchase transaction, settlement date								Mar. 1, 2020
Repayment of convertible notes				199,900,000
Increase in convertale notes				17,900,000
Deferred unamortized cost				1,300,000					$ 12,800,000	50,400,000
Convertible note repayment fee				500,000
Loss on Early repayment of debt				$ 19,700,000
3.75% Convertible Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of common share price over conversion price for conversion									130.00%
Common stock price trading days | Tradingday									20
Common stock price consecutive trading days | Tradingday									30
3.75% Convertible Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price, percentage									98.00%
Common stock price trading days | Tradingday									5
Common stock price consecutive trading days | Tradingday									5
3.75% Convertible Senior Notes [Member] | Issuance Costs [Member]
Debt Instrument [Line Items]
Loan origination fees									$ 10,400,000
Additional paid-in-capital									2,900,000
Issuance cost recorded to deferred financing costs									7,500,000
3.75% Convertible Senior Notes [Member] | Institutional Buyers [Member]
Debt Instrument [Line Items]
Aggregate principal amount			340,000,000
Principal amount of Convertible Notes, subsequently exercised			$ 21,900,000
Amended and Restated Senior Term Facility [Member]
Debt Instrument [Line Items]
Loan origination fees									22,200,000
Amortization of deferred financing costs										1,400,000
Outstanding principal balance paid		$ 287,700,000
Voluntary prepayment premium paid percentage		3.00%
Voluntary prepayment premium paid		$ 8,600,000
Write off of deferred financing costs		$ 6,800,000							1,300,000
Non lender fees									4,100,000
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount									690,000,000	690,000,000
Unamortized debt premium and consent fees									12,700,000	15,500,000
Total debt									702,670,000	$ 705,520,000
6.00% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 237,800,000
Interest rate					6.00%
Amortization of deferred financing costs									200,000
Debt issuance costs									6,200,000
Debt instrument redemption price, percentage					100.00%
Option granted to initial purchasers					$ 32,300,000
Principal amount of Convertible Notes, subsequently exercised					22,800,000
Additional paid-in-capital					49,100,000
Convertible Notes, carrying amount of liability component					$ 188,700,000				190,100,000
Effective interest rate on convertible notes					13.60%
Proceeds received from the issuance of the convertible notes					$ 237,800,000				237,800,000
Convertible Notes, unamortized discount									47,700,000
Conversion rate					166.6667
Principal amount					$ 1,000
Conversion price | $ / shares					$ 6
Multiples of principal amount					$ 1,000
Deferred unamortized cost									$ 47,700,000
6.00% Convertible Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of common share price over conversion price for conversion									130.00%
Common stock price trading days | Tradingday									20
Common stock price consecutive trading days | Tradingday									30
6.00% Convertible Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price, percentage									98.00%
Common stock price trading days | Tradingday									5
Common stock price consecutive trading days | Tradingday									5
6.00% Convertible Senior Notes [Member] | Issuance Costs [Member]
Debt Instrument [Line Items]
Loan origination fees					8,100,000
Additional paid-in-capital					1,700,000
Issuance cost recorded to deferred financing costs					6,400,000
6.00% Convertible Senior Notes [Member] | Institutional Buyers [Member]
Debt Instrument [Line Items]
Aggregate principal amount					$ 215,000,000

Long-Term Debt and Other Liab_4

Long-Term Debt and Other Liabilities - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Mar. 03, 2015
Debt Instrument [Line Items]
Total debt	$ 1,041,948	$ 1,017,064
Less deferred financing costs	(17,055)	(16,196)
Total long-term debt	1,024,893	1,000,868
12.500% Senior Secured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Senior Secured Notes	702,670	705,520
2022 Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	190,083
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Convertible Notes	$ 149,195	$ 311,544	$ 261,900

Long-Term Debt and Other Liab_5

Long-Term Debt and Other Liabilities - Summary of Redemption Prices Plus Accrued and Unpaid Interest (Detail) - 12.500% Senior Secured Notes Due 2022 [Member]	12 Months Ended
	Dec. 31, 2018
2019 [Member]
Debt Instrument, Redemption [Line Items]
Debt instrument redemption price, percentage	106.25%
2020 [Member]
Debt Instrument, Redemption [Line Items]
Debt instrument redemption price, percentage	103.125%
2021 and Thereafter [Member]
Debt Instrument, Redemption [Line Items]
Debt instrument redemption price, percentage	100.00%

Interest Costs - Summary of Int

Interest Costs - Summary of Interest Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Interest [Line Items]
Interest costs charged to expense	$ 100,274	$ 89,915	$ 62,348
Amortization of deferred financing costs	4,280	3,743	3,803
Accretion of Convertible Notes	21,105	19,520	17,496
Amortization of debt premium of Senior Secured Notes	(2,850)	(1,234)	0
Interest expense	122,809	111,944	83,647
Total interest costs	123,205	113,045	85,152
Property and Equipment [Member]
Schedule Of Interest [Line Items]
Interest costs capitalized	32	26	205
Software [Member]
Schedule Of Interest [Line Items]
Interest costs capitalized	$ 364	$ 1,075	$ 1,300

Common Stock and Preferred St_2

Common Stock and Preferred Stock - Additional Information (Detail) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Preferred stock share authorized	100,000,000
Preferred stock, par value	$ 0.01
Preferred stock share issued	0

Fair Value of Financial Asset_3

Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Assets fair value adjustments	$ 0	$ 0	$ 0

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Summary of Fair Value and Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Mar. 03, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,041,948	$ 1,017,064
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Long Term Debt	737,000	782,000
Total debt	702,670	705,520
2022 Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Convertible Notes	216,000
Carrying Value of Convertible Notes	190,083
2020 Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Convertible Notes	150,000	330,000
Carrying Value of Convertible Notes	$ 149,195	$ 311,544	$ 261,900

Fair Value of Financial Asset_5

Fair Value of Financial Assets and Liabilities - Summary of Fair Value and Carrying Value of Long-Term Debt (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2017
3.75% Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Unamortized Discount	$ 12.8	$ 1.3	$ 50.4
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt premium and consent fees	12.7		$ 15.5
6% Convertible Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Unamortized Discount	$ 47.7

Business Segments and Major C_3

Business Segments and Major Customers - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)SegmentCustomerPartner	Dec. 31, 2017USD ($)CustomerPartner	Dec. 31, 2016USD ($)Customer
Segment Reporting Information [Line Items]
Number of operating segments | Segment									3
Equipment revenue | $	$ 217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	$ 893,764	$ 699,090	$ 596,550
Transition Agreement To Airline Directed Model [Member]
Segment Reporting Information [Line Items]
Equipment revenue | $									$ 45,400
Revenue [Member]
Segment Reporting Information [Line Items]
Number of customers meeting concentration risk threshold | Customer									0	0	0
Revenue [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of benchmark									15.00%		10.00%
Revenue [Member] | Customer Concentration Risk [Member] | Delta Airline and American Airlines [Member]
Segment Reporting Information [Line Items]
Percentage of benchmark									23.00%	26.00%	27.00%
Revenue [Member] | Customer Concentration Risk [Member] | American Airlines [Member]
Segment Reporting Information [Line Items]
Percentage of benchmark									22.00%	21.00%	23.00%
Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Number of customers meeting concentration risk threshold | Customer									1
Number of airline partners meeting concentration risk threshold | Partner									1	1
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of benchmark									11.00%	15.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Delta Air Lines [Member]
Segment Reporting Information [Line Items]
Percentage of benchmark									11.00%	21.00%

Business Segments and Major C_4

Business Segments and Major Customers - Summary of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	$ 893,764	$ 699,090	$ 596,550
Segment profit (loss)									71,430	59,233	67,107
Service [Member]
Segment Reporting Information [Line Items]
Total revenue									630,147	617,906	514,293
Product [Member]
Segment Reporting Information [Line Items]
Total revenue									263,617	81,184	82,257
CA-NA [Member]
Segment Reporting Information [Line Items]
Total revenue									469,217	400,613	371,523
Segment profit (loss)									26,228	66,802	71,870
CA-NA [Member] | Service [Member]
Segment Reporting Information [Line Items]
Total revenue									367,368	393,484	357,250
CA-NA [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenue									101,849	7,129	14,273
CA-ROW [Member]
Segment Reporting Information [Line Items]
Total revenue									134,394	57,865	25,378
Segment profit (loss)									(94,537)	(106,978)	(87,637)
CA-ROW [Member] | Service [Member]
Segment Reporting Information [Line Items]
Total revenue									66,402	53,542	24,198
CA-ROW [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenue									67,992	4,323	1,180
BA [Member]
Segment Reporting Information [Line Items]
Total revenue									290,153	240,612	199,649
Segment profit (loss)									139,739	99,409	82,874
BA [Member] | Service [Member]
Segment Reporting Information [Line Items]
Total revenue									196,377	170,880	132,845
BA [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenue									$ 93,776	$ 69,732	$ 66,804

Business Segments and Major C_5

Business Segments and Major Customers - Reconciliation of Segment Profit (loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit (loss)	$ 71,430	$ 59,233	$ 67,107
Interest income	4,292	2,964	1,635
Interest expense	(122,809)	(111,944)	(83,647)
Depreciation and amortization	(133,617)	(145,490)	(105,642)
Transition to airline-directed model	21,551
Amortization of deferred airborne lease incentives	31,650	41,816	29,519
Amortization of STC costs	(1,023)
Stock compensation expense	(16,912)	(19,821)	(17,621)
Adjustment of deferred financing fees			792
Loss on extinguishment of debt	(19,653)		(15,406)
Other income (expense)	(233)	(750)	72
Loss before income taxes	(165,324)	(173,992)	(123,191)
CA-NA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit (loss)	26,228	66,802	71,870
CA-ROW [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit (loss)	(94,537)	(106,978)	(87,637)
BA [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profit (loss)	$ 139,739	$ 99,409	$ 82,874

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)CompensationPlanshares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2013shares
Schedule Of Share Based Compensation Arrangement [Line Items]
Number of share-based employee compensation plans | CompensationPlan	3
Stock options [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Stock options exercised	2,500
Restricted Stock Units And Deferred Stock Units [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
DSU settlement period	90 days
Total unrecognized compensation costs related to unvested stock options | $ | $	$ 15
Weighted average period related to unvested stock options	1 year 10 months 24 days
Total grant date fair value of stock options vested | $ | $	$ 8
Restricted Stock [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Total unrecognized compensation costs related to unvested stock options | $ | $	$ 1
Weighted average period related to unvested stock options	1 year 10 months 24 days
Stock Plan 2010, 2013 and 2016 [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Common stock, shares reserved for issuance	27,906,570
Shares available for grant	7,841,256
Contractual life of granted options	10 years
Options vesting period	4 years
Stock options exercised				0
Stock Plan 2010, 2013 and 2016 [Member] | Stock options [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Total unrecognized compensation costs related to unvested stock options | $ | $	$ 12
Weighted average period related to unvested stock options	2 years 4 months 24 days
Total grant date fair value of stock options vested | $ | $	$ 9	$ 10	$ 9
Stock Plan 2010, 2013 and 2016 [Member] | Option 2 [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Options vesting percentage	25.00%
Options vesting period	4 years
Stock Plan 2010, 2013 and 2016 [Member] | Option 1 [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Options vesting percentage	20.00%
Stock Plan 2010, 2013 and 2016 [Member] | Director [Member] | Restricted Stock Units And Deferred Stock Units [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
2013 Omnibus Plan settlement, Description	DSUs will be settled in shares of our common stock 90 days after the director ceases to serve as a director.
Employee Stock Purchase Plan [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Common stock, shares reserved for issuance	1,200,000
Common stock, shares issued under ESPP	320,905
Employee Stock Purchase Plan [Member] | Maximum [Member]
Schedule Of Share Based Compensation Arrangement [Line Items]
Purchase Price of Common Stock, Percent	15.00%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 16,912	$ 19,821	$ 17,621
Cost of Service Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	1,659	1,748	1,499
Cost of Equipment Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	210	185	117
Engineering, Design and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	3,347	3,656	3,046
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	4,267	4,751	4,962
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 7,429	$ 9,481	$ 7,997

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Stock Options Activity (Detail) - Stock options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Stock Option Activity [Line Items]
Options Outstanding, Beginning Balance	10,387,376
Number of Options, Granted	2,537,353
Number of Options, Exercised	(2,500)
Number of Options, Forfeited	(776,246)
Number of Options, Expired	(1,431,825)
Options Outstanding, Ending Balance	10,714,158	10,387,376
Options Exercisable, Ending Balance	6,363,744
Weighted Average Exercise Price Per Share, Outstanding Beginning Balance	$ 13.96
Weighted Average Exercise Price Per Share, Granted	9.20
Weighted Average Exercise Price Per Share, Exercised	8.37
Weighted Average Exercise Price Per Share, Forfeited	11.19
Weighted Average Exercise Price Per Share, Expired	15.61
Weighted Average Exercise Price Per Share, Outstanding Ending Balance	12.81	$ 13.96
Weighted Average Exercise Price Per Share, Exercisable Ending Balance	$ 14.24
Weighted Average Remaining Contractual Life, Outstanding	6 years 3 months	6 years 2 months 19 days
Weighted Average Remaining Contractual Life, Exercisable Ending Balance	4 years 9 months 4 days
Aggregate Intrinsic Value, Outstanding	$ 0	$ 8,924
Aggregate Intrinsic Value, Exercisable Ending Balance	$ 0

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Weighted Average Assumptions Used and Weighted Average Grant Date Fair Value of Stock Options (Detail) - Stock options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Approximate risk-free interest rate	2.70%	2.30%	1.30%
Average expected life (years)	6 years 11 days	6 years 1 month 20 days	6 years 1 month 13 days
Dividend yield	0.00%	0.00%	0.00%
Volatility	49.20%	45.30%	45.30%
Weighted average grant date fair value of stock options granted	$ 4.42	$ 5.59	$ 3.88
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average grant date fair value of stock options granted	$ 8.97	$ 11.97	$ 8.72

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summarizes the Activities for Unvested RSUs and DSUs (Detail) - Restricted Stock Units And Deferred Stock Units [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Underlying Shares, Unvested - Beginning balance | shares	1,717,857
Number of Underlying Shares, Granted | shares	2,747,836
Number of Underlying Shares, Vested | shares	(653,447)
Number of Underlying Shares, Forfeited/canceled | shares	(588,266)
Number of Underlying Shares, Unvested - Ending balance | shares	3,223,980
Weighted Average Grant Date Fair Value, Unvested - Beginning balance | $ / shares	$ 11.27
Weighted Average Grant Date Fair Value, Granted | $ / shares	5.11
Weighted Average Grant Date Fair Value, Vested | $ / shares	11.53
Weighted Average Grant Date Fair Value, Forfeited/canceled | $ / shares	8.24
Weighted Average Grant Date Fair Value, Unvested - Ending balance | $ / shares	$ 6.51

Stock-Based Compensation - Su_4

Stock-Based Compensation - Summarizes the Activity for Restricted Stock (Detail) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Underlying Shares, Unvested - Beginning balance | shares	214,144
Number of Underlying Shares, Granted | shares	0
Number of Underlying Shares, Vested | shares	(93,266)
Number of Underlying Shares, Forfeited/canceled | shares	(2,825)
Number of Underlying Shares, Unvested - Ending balance | shares	118,053
Weighted Average Grant Date Fair Value, Unvested - Beginning balance | $ / shares	$ 13.62
Weighted Average Grant Date Fair Value, Granted | $ / shares	0
Weighted Average Grant Date Fair Value, Vested | $ / shares	15.23
Weighted Average Grant Date Fair Value, Forfeited/canceled | $ / shares	12.42
Weighted Average Grant Date Fair Value, Unvested - Ending balance | $ / shares	$ 12.38

Employee Retirement and Postr_2

Employee Retirement and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employee Contribution	100.00%
Percentage of employees contribution matched by the company	4.00%
Employer Contribution	$ 5.1	$ 5.9	$ 4.1

Income Tax - (Loss) Before Inco

Income Tax - (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
United States	$ (128,361)	$ (138,881)	$ (108,363)
Foreign	(36,963)	(35,111)	(14,828)
Loss before income taxes	$ (165,324)	$ (173,992)	$ (123,191)

Income Tax - Components of (Ben

Income Tax - Components of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 0	$ 0	$ 0
State	467	235	451
Foreign	61	49	24
Current Total	528	284	475
Deferred:
Federal	(3,908)	(2,590)	764
State	87	309	75
Deferred Total	(3,821)	(2,281)	839
Total	$ (3,293)	$ (1,997)	$ 1,314

Income Tax - Income Tax Compute

Income Tax - Income Tax Computed at Federal Statutory Tax Rates (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	35.00%	35.00%
Impact of change in tax rate	0.10%	(47.00%)
Change in valuation allowance	(24.80%)	12.50%	(38.50%)
State income taxes-net of federal tax benefit	4.00%	2.40%	3.80%
Other	1.70%	(1.80%)	(1.40%)
Effective tax rate	2.00%	1.10%	(1.10%)

Income Tax - Components of Defe

Income Tax - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Compensation accruals	$ 3,407	$ 4,854
Stock options	15,552	13,256
Inventory	1,102	702
Warranty reserves	1,014	605
Deferred rent	9,603	9,868
Deferred revenue	37,501	51,295
Federal net operating loss (NOL)	143,433	129,064
State NOL	24,623	21,122
Interest carryforward	22,029
UNICAP adjustment	2,311	3,241
Finite-lived intangible assets	7,576	8,756
Other	11,576	7,500
Total deferred income tax assets	279,727	250,263
Fixed assets	(53,944)	(59,885)
Indefinite-lived intangible assets	(6,528)	(5,983)
Convertible Notes discount	(14,612)	(12,243)
Other	(2,272)	(170)
Total deferred income tax liabilities	(77,356)	(78,281)
Total deferred income tax	202,371	171,982
Valuation allowance	(204,533)	(177,965)
Net deferred income tax liability	$ (2,162)	$ (5,983)

Income Tax - Additional Informa

Income Tax - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Utilization of NOL and tax credit carryforwards due to ownership changes	50.00%
Decrease in net deferred tax liability due to tax reform	$ 3,000,000
Unrecognized tax benefits	0	$ 0	$ 0
Interest or penalties related to uncertain tax positions	0	0	$ 0
Liabilities for interest and potential penalties	0	$ 0
Increase (decrease) in unrecognized tax benefits	0
Federal net operating loss [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforward	574,000,000
State NOL [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforward	$ 419,000,000

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Line Items]
Amortization of deferred airborne lease incentives	$ 31,650	$ 41,816	$ 29,519
Deferred airborne lease incentives included in current liabilities	24,145	42,096
Deferred airborne lease incentives included in non-current liabilities	129,086	142,938
Revenue share expense, net of amortization of deferred airborne lease incentives	24,500	30,500	41,600
Property and equipment, gross	944,772	1,053,923
Present value of net minimum lease payments	853
Present value of net minimum lease payments, current portion	652	1,789
Present value of net minimum lease payments, non-current portion	200
Leased Computer Equipment [Member]
Leases [Line Items]
Property and equipment, gross	6,300
Leased Network Equipment [Member]
Leases [Line Items]
Property and equipment, gross	7,500
Certain Facilities and Equipment [Member]
Leases [Line Items]
Rental expense	12,600	12,000	11,800
Cell Site Leases [Member]
Leases [Line Items]
Rental expense	$ 10,500	$ 9,500	$ 9,400
Minimum [Member] | Computer Equipment [Member]
Leases [Line Items]
Annual interest rate imputed	8.00%
Maximum [Member] | Computer Equipment [Member]
Leases [Line Items]
Annual interest rate imputed	14.00%

Leases - Annual Future Minimum

Leases - Annual Future Minimum Obligations for Operating Leases Other than Arrangements with Commercial Airline Partners (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2,019	$ 21,902
2,020	19,867
2,021	19,742
2,022	18,420
2,023	14,826
Thereafter	$ 78,100

Leases - Annual Future Minimu_2

Leases - Annual Future Minimum Obligation under Capital Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2,019	$ 707
2,020	218
Thereafter	0
Total minimum lease payments	925
Less: Amount representing interest	(72)
Present value of net minimum lease payments	$ 853

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
2,019		$ 98,900,000
2,020		89,400,000
2,021		76,900,000
2,022		66,100,000
2,023		58,600,000
Thereafter		159,000,000
Contingent annual cash rebate	$ 1,800,000
Potential losses accrued		$ 0
Linksmart Litigation [Member]
Loss Contingencies [Line Items]
Litigation filing date		April 20, 2018
Securities Litigation [Member]
Loss Contingencies [Line Items]
Litigation filing date		December 10, 2018
Derivative Litigation [Member]
Loss Contingencies [Line Items]
Litigation filing date		September 25, 2018 and September 26, 2018

Quarterly Data (Unaudited) - Su

Quarterly Data (Unaudited) - Summarized Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 217,224	$ 217,257	$ 227,458	$ 231,825	$ 188,010	$ 172,874	$ 172,800	$ 165,406	$ 893,764	$ 699,090	$ 596,550
Operating loss	(9,691)	(7,610)	(7,449)	(2,171)	(14,427)	(17,801)	(17,336)	(14,698)	(26,921)	(64,262)	(26,637)
Net loss	(59,688)	(37,717)	(37,207)	(27,419)	(41,138)	(45,281)	(44,209)	(41,367)	(162,031)	(171,995)	(124,505)
Net loss attributable to common stock	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	$ (162,031)	$ (171,995)	$ (124,505)
Net loss attributable to common stock per share - basic and diluted	$ (0.74)	$ (0.47)	$ (0.47)	$ (0.34)	$ (0.52)	$ (0.57)	$ (0.56)	$ (0.52)	$ (2.02)	$ (2.17)	$ (1.58)
Weighted average number of shares - basic and diluted	80,303	80,196	79,783	79,696	79,603	79,543	79,334	79,139	80,038	79,407	78,915

Condensed Financial Informati_3

Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and cash equivalents	$ 184,155	$ 196,356	$ 117,302
Short-term investments	39,323	212,792
Prepaid expenses and other current assets	34,695	20,310
Other non-current assets	84,212	67,107
Total assets	1,265,096	1,403,175
Liabilities and stockholders' deficit:
Total current liabilities	299,687	316,278
Long-term debt	1,024,893	1,000,868
Other non-current liabilities	80,191	134,655
Total liabilities	1,533,857	1,594,739
Total stockholders' deficit	(268,761)	(191,564)	(40,393)	$ 66,195
Total liabilities and stockholders' deficit	1,265,096	1,403,175
Parent Company [Member]
Assets:
Cash and cash equivalents	161,113	9,734	$ 1,071
Short-term investments	39,323	192,893
Prepaid expenses and other current assets	738	913
Other non-current assets	101	100
Total assets	201,275	203,640
Liabilities and stockholders' deficit:
Total current liabilities	3,998	4,847
Long-term debt	332,211	307,968
Other non-current liabilities	2,162	5,983
Investments and payables with subsidiaries	131,665	76,406
Total liabilities	470,036	395,204
Total stockholders' deficit	(268,761)	(191,564)
Total liabilities and stockholders' deficit	$ 201,275	$ 203,640

Condensed Financial Informati_4

Condensed Financial Information of Registrant - Condensed Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Interest income									$ (4,292)	$ (2,964)	$ (1,635)
Interest expense									122,809	111,944	83,647
Loss on extinguishment of debt									19,653		15,406
Total other expense									138,403	109,730	96,554
Income (loss) before income taxes									(165,324)	(173,992)	(123,191)
Income tax provision (benefit)									(3,293)	(1,997)	1,314
Net loss	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	(162,031)	(171,995)	(124,505)
Comprehensive loss									(164,652)	(170,765)	(124,480)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Interest income									(3,123)	(1,681)	(978)
Interest expense									36,984	34,577	32,461
Loss on extinguishment of debt									19,653
Total other expense									53,514	32,896	31,483
Income (loss) before income taxes									(53,514)	(32,896)	(31,483)
Income tax provision (benefit)									(3,354)	(2,045)	1,276
Equity losses of subsidiaries									111,871	141,144	91,746
Net loss									(162,031)	(171,995)	(124,505)
Comprehensive loss									$ (162,031)	$ (171,995)	$ (124,480)

Condensed Financial Informati_5

Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net loss	$ (59,688)	$ (37,717)	$ (37,207)	$ (27,419)	$ (41,138)	$ (45,281)	$ (44,209)	$ (41,367)	$ (162,031)	$ (171,995)	$ (124,505)
Accretion of debt discount									21,105	19,520	17,496
Amortization of deferred financing costs									4,280	3,743	3,803
Loss on extinguishment of debt									19,653		15,406
Deferred income taxes									(3,821)	(2,281)	839
Acquisition of short-term investments									(39,323)	(317,418)	(363,436)
Redemption of short-term investments									212,792	443,103	244,450
Financing activities:
Proceeds from issuance of convertible notes									237,750
Repurchase of convertible notes									(200,438)
Payment of debt issuance costs									(8,054)	(3,630)	(11,474)
Cash, cash equivalents and restricted cash at beginning of period				203,729				125,189	203,729	125,189	155,453
Cash, cash equivalents and restricted cash at end of period	191,116				203,729				191,116	203,729	125,189
Less: current restricted cash	1,535				500				1,535	500	114
Less: non-current restricted cash	5,426				6,873				5,426	6,873	7,773
Cash and cash equivalents at end of period	184,155				196,356				184,155	196,356	117,302
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net loss									(162,031)	(171,995)	(124,505)
Accretion of debt discount									21,105	19,520	17,496
Amortization of deferred financing costs									1,648	1,484	1,392
Loss on extinguishment of debt									19,653
Subsidiary equity losses									111,871	141,144	91,746
Deferred income taxes									(3,821)	(2,281)	839
Other operating activities									(674)	(609)	(319)
Net cash used in operating activities									(12,249)	(12,737)	(13,351)
Acquisition of short-term investments									(39,323)	(192,893)	(213,905)
Redemption of short-term investments									192,893	213,905	179,593
Investments and advances with subsidiaries									(19,595)	601	(23,312)
Net cash provided by (used in) investing activities									133,975	21,613	(57,624)
Financing activities:
Proceeds from issuance of convertible notes									237,750	0	0
Repurchase of convertible notes									(200,438)
Payment of debt issuance costs									(8,054)
Other financing activities									396	(227)	271
Net cash provided by (used in) financing activities									29,654	(227)	271
Increase (decrease) in cash, cash equivalents and restricted cash									151,380	8,649	(70,704)
Cash, cash equivalents and restricted cash at beginning of period				$ 9,834				$ 1,185	9,834	1,185	71,889
Cash, cash equivalents and restricted cash at end of period	161,214				9,834				161,214	9,834	1,185
Less: current restricted cash											114
Less: non-current restricted cash	101				100				101	100
Cash and cash equivalents at end of period	$ 161,113				$ 9,734				$ 161,113	$ 9,734	$ 1,071