Airgain (AIRG) 10-Q 7 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	AIRG
Entity Registrant Name	AIRGAIN INC
Entity Central Index Key	0001272842
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-37851
Entity Tax Identification Number	95-4523882
Entity Address, Address Line One	3611 Valley Centre Drive
Entity Address, Address Line Two	Suite 150
Entity Address, City or Town	San Diego
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92130
City Area Code	760
Local Phone Number	579-0200
Entity Common Stock, Shares Outstanding		9,696,984
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common shares, par value $0.0001 per share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE

Condensed Balance Sheets (Unaud

Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 12,871	$ 13,621
Short term investments	21,001	20,169
Trade accounts receivable	8,564	7,013
Inventory	1,265	1,351
Prepaid expenses and other current assets	1,386	931
Total current assets	45,087	43,085
Property and equipment, net	1,791	1,401
Goodwill	3,700	3,700
Customer relationships, net	3,231	3,593
Intangible assets, net	730	859
Other assets	601	269
Total assets	55,140	52,907
Current liabilities:
Accounts payable	4,447	4,137
Accrued bonus	1,402	2,076
Accrued liabilities	1,461	1,217
Current portion of deferred rent obligation under operating lease	127	81
Total current liabilities	7,437	7,511
Deferred tax liability	38	38
Deferred rent obligation under operating lease	46	211
Total liabilities	7,521	7,760
Stockholders’ equity:
Common shares, par value $0.0001, 200,000 shares authorized; 10,117 shares issued and 9,697 shares outstanding at September 30, 2019; and 9,958 shares issued and 9,601 shares outstanding at December 31, 2018.	1	1
Additional paid in capital	95,967	93,583
Treasury stock, at cost: 420 shares and 357 shares at September 30, 2019 and December 31, 2018, respectively	(4,231)	(3,432)
Accumulated other comprehensive income (loss)	13	(11)
Accumulated deficit	(44,131)	(44,994)
Total stockholders’ equity	47,619	45,147
Commitments and contingencies (note 12)
Total liabilities and stockholders’ equity	$ 55,140	$ 52,907

Condensed Balance Sheets (Una_2

Condensed Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	10,117,000	9,958,000
Common stock, shares outstanding	9,697,000	9,601,000
Treasury stock, shares at cost	420,000	357,000

Condensed Statements of Operati

Condensed Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Sales	$ 13,142	$ 15,787	$ 42,713	$ 44,064
Cost of goods sold	7,067	8,922	23,167	24,403
Gross profit	6,075	6,865	19,546	19,661
Operating expenses:
Research and development	2,403	2,475	6,944	7,162
Sales and marketing	1,461	2,161	5,964	9,140
General and administrative	2,416	1,922	6,168	7,864
Total operating expenses	6,280	6,558	19,076	24,166
Income (loss) from operations	(205)	307	470	(4,505)
Other expense (income):
Interest income	(183)	(159)	(559)	(398)
Gain on deferred purchase price liability				(389)
Interest expense		6	1	30
Total other income	(183)	(153)	(558)	(757)
Income (loss) before income taxes	(22)	460	1,028	(3,748)
Provision for income taxes	113	23	165	110
Net income (loss)	$ (135)	$ 437	$ 863	$ (3,858)
Net income (loss) per share:
Basic	$ (0.01)	$ 0.05	$ 0.09	$ (0.41)
Diluted	$ (0.01)	$ 0.04	$ 0.09	$ (0.41)
Weighted average shares used in calculating income (loss) per share:
Basic	9,711	9,566	9,678	9,495
Diluted	9,711	10,093	10,083	9,495

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (135)	$ 437	$ 863	$ (3,858)
Unrealized gain on available-for-sale securities, net of deferred taxes	1	3	24	10
Total comprehensive income (loss)	$ (134)	$ 440	$ 887	$ (3,848)

Condensed Statements of Stockho

Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2017	$ 46,225	$ 1	$ 89,908	$ (1,257)	$ (17)	$ (42,410)
Stock-based compensation			2,536
Issuance of shares for stock purchase plans			616
Repurchases of common stock				(1,837)
Unrealized gain on available-for-sale securities, net of deferred taxes	10				10
Net income (loss)	(3,858)					(3,858)
Ending balance at Sep. 30, 2018	43,692	1	93,060	(3,094)	(7)	(46,268)
Beginning balance at Jun. 30, 2018	43,041	1	92,336	(2,580)	(10)	(46,706)
Stock-based compensation			408
Issuance of shares for stock purchase plans			316
Repurchases of common stock				(514)
Unrealized gain on available-for-sale securities, net of deferred taxes	3				3
Net income (loss)	437					438
Ending balance at Sep. 30, 2018	43,692	1	93,060	(3,094)	(7)	(46,268)
Beginning balance at Dec. 31, 2018	45,147	1	93,583	(3,432)	(11)	(44,994)
Stock-based compensation			1,605
Issuance of shares for stock purchase plans			779
Repurchases of common stock				(799)
Unrealized gain on available-for-sale securities, net of deferred taxes	24				24
Net income (loss)	863					863
Ending balance at Sep. 30, 2019	47,619	1	95,967	(4,231)	13	(44,131)
Beginning balance at Jun. 30, 2019	47,620	1	95,228	(3,625)	12	(43,996)
Stock-based compensation			549
Issuance of shares for stock purchase plans			190
Repurchases of common stock				(606)
Unrealized gain on available-for-sale securities, net of deferred taxes	1				1
Net income (loss)	(135)					(135)
Ending balance at Sep. 30, 2019	$ 47,619	$ 1	$ 95,967	$ (4,231)	$ 13	$ (44,131)

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 863,000	$ (3,858,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	373,000	423,000
Amortization	491,000	508,000
Amortization of discounts on investments, net	(248,000)	(94,000)
Stock-based compensation	1,605,000	2,536,000
Deferred tax liability		22,000
Gain on deferred purchase price liability		(389,000)
Changes in operating assets and liabilities:
Trade accounts receivable	(1,551,000)	667,000
Inventory	86,000	(476,000)
Prepaid expenses and other assets	(500,000)	(256,000)
Accounts payable	305,000	36,000
Accrued bonus	(674,000)	154,000
Accrued liabilities	244,000	(426,000)
Deferred obligation under operating lease	(119,000)	(88,000)
Net cash provided by (used in) operating activities	875,000	(1,241,000)
Cash flows from investing activities:
Purchases of available-for-sale securities	(30,080,000)	(24,329,000)
Maturities of available-for-sale securities	29,520,000	26,956,000
Purchases of property and equipment	(1,045,000)	(752,000)
Net cash provided by (used in) investing activities	(1,605,000)	1,875,000
Cash flows from financing activities:
Repayment of notes payable		(1,000,000)
Payment on deferred purchase price liability		(375,000)
Repurchases of common stock	(799,000)	(1,837,000)
Proceeds from issuance of common stock	779,000	617,000
Net cash used in financing activities	(20,000)	(2,595,000)
Net decrease in cash and cash equivalents	(750,000)	(1,961,000)
Cash and cash equivalents, beginning of period	13,621,000	15,026,000
Cash and cash equivalents, end of period	12,871,000	13,065,000
Supplemental disclosure of cash flow information:
Interest paid	1,000	34,000
Taxes paid	54,000	$ 26,000
Supplemental disclosure of non-cash investing and financing activities:
Accrual of property and equipment	$ 4,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Business Description Airgain, Inc. (the Company) was incorporated in the State of California on March 20, 1995; and reincorporated in the State of Delaware on August 15, 2016. The Company is a leading provider of advanced antenna technologies used to enable high performance wireless networking across a broad range of markets, including consumer, enterprise and automotive. The Company designs, develops, and engineers its antenna products for original equipment and design manufacturers worldwide. The Company’s headquarters is in San Diego, California with office space and research, design and test facilities in the United States, United Kingdom, and China. Basis of Presentation The accompanying unaudited condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and applicable rules and regulations of the Securities and Exchange Commission (SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Interim financial results are not necessarily indicative of results anticipated for the full year. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, from which the balance sheet information herein was derived. The unaudited condensed balance sheet as of December 31, 2018, included herein was derived from the audited financial statements as of that date but does not include all disclosures including notes required by GAAP. The unaudited condensed statements of operations for the three and nine months ended September 30, 2019 and 2018, and the balance sheet data as of September 30, 2019, have been prepared on the same basis as the audited financial statements. In the opinion of management, the accompanying unaudited condensed financial statements reflect all adjustments, consisting of normal and recurring adjustments, necessary for a fair presentation of results of the Company’s operations and financial position for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2019, or for any future period. Segment Information The Company’s operations are located primarily in the United States and most of its assets are located in San Diego, California and Scottsdale, Arizona. The Company operates in one segment related to the sale of antenna products. The Company’s chief operating decision-maker is its chief executive officer, who reviews operating results on an aggregate basis and manages the Company’s operations as a single operating segment. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include valuation of intangible assets and goodwill. Reclassifications Certain amounts in the prior period financial statements have been reclassified to conform to the presentation of the current period financial statements. Fair Value Measurements The carrying values of the Company’s financial instruments, including cash and cash equivalents, trade accounts receivable, accounts payable, and accrued liabilities approximate their fair values due to the short maturity of these instruments. Fair value measurements are market-based measurements, not entity-specific measurements. Therefore, fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. The Company follows a three-level hierarchy to prioritize the inputs used in the valuation techniques to derive fair values. The basis for fair value measurements for each level within the hierarchy is described below: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3: Valuations derived from valuation techniques in which one or more significant inputs are unobservable in active markets. Cash Equivalents and Short-Term Investments Cash equivalents are comprised of short-term, highly liquid investments with maturities of 90 days or less at the date of purchase. Short-term investments consist predominantly of commercial paper, corporate debt securities, U.S. Treasury securities and asset backed securities. The Company classifies short-term investments based on the facts and circumstances surrounding the investments at the time of purchase and evaluates such classification as of each balance sheet date. All short-term investments are classified as available-for-sale securities as of September 30, 2019, and are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are included in other income, in the unaudited condensed statements of operations. The Company evaluates its investments to determine whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered to be other than temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before recovery of their cost basis. Inventory The majority of the Company’s products are manufactured by third parties that retain ownership of the inventory until title is transferred to the customer at the shipping point. In certain instances, shipping terms are delivery at place and the Company is responsible for arranging transportation and delivery of goods ready for unloading at the named place. The Company bears all risk involved in bringing the goods to the named place and records the related inventory in transit to the customer as inventory on the accompanying balance sheet. The Company also manufactures certain of its products at its facility located in Scottsdale, Arizona. Inventory is stated at the lower of cost or net realizable value. For items manufactured by the Company, cost is determined using the weighted average cost method. For items manufactured by third parties, cost is determined using the first-in, first-out (FIFO) method. Any adjustments to reduce the cost of inventories to their net realizable value are recognized in earnings in the current period. As of September 30, 2019, the Company’s inventories consist primarily of raw materials. Provisions for excess and obsolete inventories are estimated based on product life cycles, quality issues, and historical experience. As of September 30, 2019, there is no provision for excess and obsolete inventories. Accumulated Other Comprehensive Income (Loss) Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Accumulated other comprehensive income (loss) on the unaudited condensed balance sheet at September 30, 2019, includes unrealized gains and losses on the Company’s available-for-sale securities.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies During the three and nine months ended September 30, 2019, there have been no material changes to the Company’s significant accounting policies as described in the Annual Report on Form 10-K for the fiscal year ended December 31, 2018. Recent Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which simplifies the test for goodwill impairment by removing Step 2 which requires a hypothetical purchase price allocation and may require the services of valuation experts. An entity will, therefore, perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value, not to exceed the total amount of goodwill allocated to the reporting unit. An entity still has the option to perform a qualitative assessment to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective for the Company in annual periods beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021, with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has not yet determined whether it will early adopt ASU 2017-04 and is evaluating the impact the standard will have on its ongoing financial reporting. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments In May 2019, the FASB issued ASU 2019-05, Financial Instruments-Credit Losses (Topic 326), Targeted Transition Relief

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	No te 3. Net Income (Loss) Per Share Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted average shares of common stock outstanding for the period. Diluted net income (loss) per share is calculated by dividing net income (loss) by the weighted average shares of common stock outstanding for the period plus amounts representing the dilutive effect of securities that are convertible into common stock. The Company calculates diluted income (loss) per common share using the treasury stock method and the as-if-converted method, as applicable. The following table presents the computation of net income (loss) per share (in thousands except per share data) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net income (loss) $ (135 ) $ 437 $ 863 $ (3,858 ) Denominator: Weighted average common shares outstanding - basic 9,711 9,566 9,678 9,495 Plus dilutive effect of potential common shares — 527 405 — Weighted average common shares outstanding - diluted 9,711 10,093 10,083 9,495 Net income (loss) per share: Basic $ (0.01 ) $ 0.05 $ 0.09 $ (0.41 ) Diluted $ (0.01 ) $ 0.04 $ 0.09 $ (0.41 ) Diluted weighted average common shares outstanding for the nine months ended September 30, 2019, includes 3,000 warrants and 402,000 options outstanding. Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because to do so would be anti-dilutive are as follows (in thousands) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Employee stock options 721 245 457 887 Warrants outstanding 51 51 — 51 Total 772 296 457 938

Cash, Cash Equivalents and Shor

Cash, Cash Equivalents and Short-Term Investments	9 Months Ended
	Sep. 30, 2019
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Short-Term Investments	Note 4. Cash, Cash Equivalents and Short-Term Investments The following tables show the Company’s cash and cash equivalents and short-term investments by significant investment category as of September 30, 2019 and December 31, 2018 (in thousands) September 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 2,968 $ — $ — $ 2,968 $ 2,968 $ — Level 1 (1) Money market funds 6,903 — — 6,903 6,903 — U.S. treasury securities 3,855 4 — 3,859 — 3,859 Subtotal 10,758 4 — 10,762 6,903 3,859 Level 2 (2) Commercial paper 9,641 — — 9,641 — 9,641 Corporate debt obligations 3,740 6 — 3,746 — 3,746 Repurchase agreements 3,000 — — 3,000 3,000 — Asset-backed securities 3,752 3 — 3,755 — 3,755 Subtotal 20,133 9 — 20,142 3,000 17,142 Total $ 33,859 $ 13 — $ 33,872 $ 12,871 $ 21,001 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 3,044 $ — $ — $ 3,044 $ 3,044 $ — Level 1 (1) Money market funds 5,482 — — 5,482 5,482 — U.S. treasury securities 1,988 — — 1,988 — 1,988 Subtotal 7,470 — — 7,470 5,482 1,988 Level 2 (2) Commercial paper 10,639 — — 10,639 2,095 8,544 Corporate debt obligations 5,964 — (7 ) 5,957 — 5,957 Repurchase agreements 3,000 — — 3,000 3,000 — Asset-backed securities 3,682 — (2 ) 3,680 — 3,680 Subtotal 23,285 — (9 ) 23,276 5,095 18,181 Total $ 33,799 — $ (9 ) $ 33,790 $ 13,621 $ 20,169 (1) Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities. (2) Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s investments were primarily valued based upon one or more valuations reported by its investment accounting and reporting service provider. The investment service provider values the securities using a hierarchical security pricing model that relies primarily on valuations provided by a third-party pricing vendor. Such valuations may be based on trade prices in active markets for identical assets or liabilities (Level 1 inputs) or valuation models using inputs that are observable either directly or indirectly (Level 2 inputs), such as quoted prices for similar assets or liabilities, yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures. The Company performs certain procedures to corroborate the fair value of its holdings, including comparing valuations obtained from its investment service provider with other pricing sources to validate the reasonableness of the valuations. The Company typically invests in highly rated securities, and its investment policy limits the amount of credit exposure to any one issuer. The policy requires investments in fixed income instruments denominated and payable in U.S. dollars only and requires investments to be investment grade, with a primary objective of minimizing the potential risk of principal loss. The Company considers the declines in market value of its short-term investments to be temporary in nature. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. As of September 30, 2019, the Company does not consider any of its investments to be other-than temporarily impaired. Contractual maturities of short-term investments as of September 30, 2019, are as follows (in thousands) Estimated Fair Value Due within one year $ 21,001

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Property and Equipment	Note 5. Property and Equipment Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to fifteen years for all other property and equipment. Property and equipment consist of the following (in thousands) September 30, 2019 December 31, 2018 Computers and software $ 496 $ 361 Furniture, fixtures, and equipment 375 339 Manufacturing and testing equipment 3,083 2,503 Leasehold improvements 907 895 4,861 4,098 Less accumulated depreciation (3,070 ) (2,697 ) $ 1,791 $ 1,401 Depreciation expense was $105,000 and $156,000 for the three months ended September 30, 2019 and 2018, respectively, and $373,000 and $423,000 for the nine months ended September 30, 2019 and 2018, respectively.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	Note 6. Intangible Assets The following is a summary of the Company’s acquired intangible assets (dollars in thousands) Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net September 30, 2019 Customer relationships 10 $ 4,830 $ 1,599 $ 3,231 Developed technologies 9 1,080 374 706 Tradename 3 120 96 24 Total intangible assets, net $ 6,030 $ 2,069 $ 3,961 December 31, 2018 Customer relationships 10 $ 4,830 $ 1,237 $ 3,593 Developed technologies 9 1,080 274 806 Tradename 3 120 67 53 Total intangible assets, net $ 6,030 $ 1,578 $ 4,452 The estimated annual amortization of intangible assets for the next five years and thereafter is shown in the following table (in thousands) Estimated Future Amortization 2019 (remaining three months) $ 164 2020 628 2021 598 2022 563 2023 563 Thereafter 1,445 Total $ 3,961 Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, and asset impairments, among other factors. Amortization expense was $163,000 and $169,000 for the three months ended September 30, 2019 and 2018, respectively, and $491,000 and $508,000 for the nine months ended September 30, 2019 and 2018, respectively.

Notes Payable and Line of Credi

Notes Payable and Line of Credit	9 Months Ended
	Sep. 30, 2019
Long Term Debt [Abstract]
Notes Payable and Line of Credit	No t In December 2015 the Company amended its amended and restated loan and security agreement with Silicon Valley Bank to include a term loan in the amount of $4.0 million. The loan requires 36 monthly installments of interest and principal. The loan matured on December 1, 2018, The interest rate was fixed at 5.0%. In January 2018 the Company entered into a second amended and restated loan and security agreement (the Amended Loan Agreement) with Silicon Valley Bank. The Amended Loan Agreement modified the amended and restated loan and security agreement to, among other things, increase the aggregate principal amount available under the revolving line of credit from $3.0 million to $10.0 million. It also removed a minimum EBITDA requirement previously applicable to the line of credit and former term loan and maintained the liquidity ratio financial covenant such that the Company must maintain a ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.25 to 1.00. The Amended Loan Agreement also set a borrowing base limit of 80% of the aggregate face amount of all eligible receivables. No balance was owed on the line of credit as of September 30, 2019 and December 31, 2018. The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.0% as of September 30, 2019) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.25 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.0% as of September 30, 2019) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020. Silicon Valley Bank maintains a first security interest over the Company’s assets, excluding intellectual property, for which Silicon Valley Bank has received a negative pledge. The Amended Loan Agreement contains customary affirmative and negative covenants and events of default applicable to the Company and any of its subsidiaries. The Company was in compliance with its financial covenants in the Amended Loan Agreement as of September 30, 2019.

Treasury Stock

Treasury Stock	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Treasury Stock	Note 8. Treasury Stock In August 2017, the Company’s Board of Directors (the Board) approved a share repurchase program (the 2017 Program) pursuant to which the Company could purchase up to $7.0 million of shares of its common stock over the twelve-month period following the establishment of the program. The repurchases under the 2017 Program were made from time to time in the open market or in privately negotiated transactions and were funded from the Company’s working capital. Repurchases were made in compliance with Rule 10b-18 of the Securities Exchange Act of 1934, as amended, subject to market conditions, available liquidity, cash flow, applicable legal requirements and other factors. All shares of common stock repurchased under the Company’s 2017 Program were returned to the status of authorized but unissued shares of common stock. On August 7, 2018, the Board approved an extension to the 2017 Program for an additional twelve-month period ending on August 14, 2019. On September 9, 2019, the Board approved a new share repurchase program pursuant to which the Company may purchase up to $7.0 million of shares of its common stock over the following twelve-months. All shares purchased in the three months ended September 30, 2019 were subject to the new share repurchase program. This newly adopted share repurchase program mirrors all aspects and terms of the 2017 Program as described above. During the three and nine months ended September 30, 2019, the Company repurchased 48,000 and 63,000 shares of common stock, respectively, under the share repurchase programs. For the three months ended September 30, 2019, the shares were repurchased at an average price per share of $12.54 per share, for a total cost of $0.6 million. For the nine months ended September 30, 2019, the shares were repurchased at an average price of $12.75 per share, for a total cost of $0.8 million. As of September 30, 2019, the Company repurchased a total of $3.6 million in common stock under the recently expired 2017 Program.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 9. Income Taxes The Company’s effective income tax rate was 16.1% and (2.9)% for the nine months ended September 30, 2019 and 2018, respectively. The variance from the U.S. federal statutory tax rate of 21% for each of the nine months ended September 30, 2019 and 2018, was primarily attributable to the utilization of deferred tax attributes that had a full valuation allowance. Management assesses its deferred tax assets quarterly to determine whether all or any portion of the asset is more likely than not unrealizable under Accounting Standards Codification (ASC) Topic 740. The Company is required to establish a valuation allowance for any portion of the asset that management concludes is more likely than not to be unrealizable. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. The Company’s assessment considers all evidence, both positive and negative, including the nature, frequency and severity of any current and cumulative losses, taxable income in carryback years, the scheduled reversal of deferred tax liabilities, tax planning strategies, and projected future taxable income in making this assessment. At September 30, 2019, and December 31, 2018, the Company has a valuation allowance against net deferred tax assets but for the exclusion of a deferred tax liability generated by goodwill (an indefinite lived intangible) that may not be considered a future source of taxable income in evaluating the need for a valuation allowance.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2019
Class Of Stock Disclosures [Abstract]
Stockholders' Equity	Note 10. Stockholders’ Equity Shares Reserved for Future Issuance The following common stock (in thousands) ( 1) September 30, 2019 December Warrants issued and outstanding 51 51 Stock option awards issued and outstanding 1,866 1,407 Authorized for grants under the 2016 Equity Incentive Plan 145 (2) 464 Authorized for grants under the 2016 Employee Stock Purchase Plan 186 (3) 100 2,248 2,022 (1) (2) (3)

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Based Compensation	Note 11. Stock Based Compensation Stock Options The following table summarizes the outstanding stock option activity during the periods indicated (shares in thousands) Weighted average Number of shares Exercise price Remaining contractual term (years) Balance at December 31, 2018 1,407 $ 8.73 Granted 770 11.79 Exercised (148 ) 4.59 Expired/Forfeited (163 ) 11.36 Balance at September 30, 2019 1,866 $ 10.09 8.1 Vested and exercisable at September 30, 2019 756 $ 8.38 6.6 Vested and expected to vest at September 30, 2019 1,866 $ 10.09 8.1 The weighted average grant date fair value of options granted during the nine months ended September 30, 2019, and for the year ended December 31, 2018, was $4.18 and $3.97, respectively. For fully vested stock options, the aggregate intrinsic value as of September 30, 2019, and December 31, 2018, was $3,043,000 and $2,485,000, respectively. For stock options expected to vest, the aggregate intrinsic value as of September 30, 2019 and December 31, 2018 was $935,000 and $993,000, respectively. At September 30, 2019, and December 31, 2018, there was $4,090,000 and $2,781,000, respectively, of total unrecognized compensation cost related to unvested stock options granted under the Company’s equity plans. That cost is expected to be recognized over the next three years and is based on the date the options were granted. Restricted Stock During the nine months ended September 30, 2019, the Company granted 95,478 Restricted Stock Units (RSUs) at a weighted average grant date fair value of $11.35 per share. No RSUs vested during the three and nine months ended September 30, 2019. As of September 30, 2019, the Company has 96,605 RSUs outstanding at a weighted average grant date fair value of $11.42 per share and a weighted average remaining contractual term of 1.8 years. As of September 30, 2019, there was $919,000 of total unrecognized compensation cost related to unvested RSUs. Employee Stock Purchase Plan (ESPP) The Company maintains the Employee Stock Purchase Plan (ESPP) that provides employees an opportunity to purchase common stock through payroll deductions. The ESPP is implemented through consecutive 6-month offering periods commencing on March 1 and September 1 of each year. The first offering period under the ESPP commenced on March 1, 2019. The purchase price is set at 85% of the fair market value of the Company's common stock on either the first or last trading day of the offering period, whichever is lower, and annual contributions are limited to the lower of 20% of an employee's eligible compensation or such other limits as apply under Section 423 of the Internal Revenue Code for such plans such as the ESPP. The ESPP is intended to qualify as an employee stock purchase plan for purposes of Section 423 of the Internal Revenue Code. Based on the 15% discount and the fair value of the option feature of the ESPP, it is considered compensatory. Compensation expense is calculated using the fair value of the employees’ purchase rights under the Black-Scholes model. The Company currently uses authorized and unissued shares to satisfy share award exercises. The Company received proceeds of $97,000 from the issuance of 10,000 shares under the ESPP in August 2019.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 12. Commitments and Contingencies (a) Operating Leases The Company has entered into lease agreements for office space and research facilities in San Diego County, California; Melbourne, Florida; Scottsdale, Arizona; Taipei, Taiwan; Shenzhen and Jiangsu, China; and Cambridgeshire, United Kingdom. Rent expense was $239,000 and $220,000 for the three months ended September 30, 2019 and 2018, respectively, and $729,000 and $687,000 for the nine months ended September 30, 2019 and 2018, respectively. The longest lease expires in June 2024. The Company moved into its facility in San Diego, California during the year ended December 31, 2014. The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company. The future minimum lease payments required under operating leases in effect at September 30, 2019, were as follows (in thousands) Year ending: 2019 (remaining three months) $ 290 2020 854 2021 387 2022 104 2023 72 2024 34 $ 1,741 (b) Indemnification In some agreements to which the Company is a party, the Company has agreed to indemnify the other party for certain matters, including, but not limited to, product liability and intellectual property. To date, there have been no known events or circumstances that have resulted in any material costs related to these indemnification provisions and no liabilities have been recorded in the accompanying financial statements.

Concentration of Credit Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2019
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	Note 13. Concentration of Credit Risk (a) Concentration of Sales and Accounts Receivable The following represents customers that accounted for 10% or more of total revenue during the three and nine months ended September 30, 2019 and 2018, and customers that accounted for 10% or more of total trade accounts receivable at September 30, 2019 and 2018. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Percentage of net revenue Customer A 34% 38% 38% 35% Customer B 18 9 14 8 Customer C 10 0 6 8 As of September 30, 2019 2018 Percentage of gross trade accounts receivable Customer A 38% 24% Customer B 15 0 Customer C 13 7 (b) Revenue by Geography Net revenue by geographic area are as follows. Revenue is attributed by geographic location based on the bill-to location of the Company’s customers. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Percentage of net revenue China 71% 79% 72% 73% Other Asia 2 5 4 6 North America 25 13 21 16 Europe 2 3 3 5 Although the Company ships the majority of antennas to its customers in China (primarily Original Design Manufacturers and distributors), the end-users of the Company’s products are much more geographically diverse. (c) Concentration of Purchases During the three and nine months ended September 30, 2019, primarily all of the Company’s products were manufactured by two vendors in China and by the Company’s facilities in Arizona.

Termination Costs

Termination Costs	9 Months Ended
	Sep. 30, 2019
Restructuring And Related Activities [Abstract]
Termination Costs	Note 14. Termination Costs On June 30, 2018, the Company terminated a marketing-related agreement to better align its sales and marketing efforts with its longer-term growth objectives and near-to-intermediate term profitability goals. In consideration of terminating the agreement, the Company paid $1.3 million in termination costs. The termination costs were included in sales and marketing expense on the unaudited condensed statements of operations for the nine months ended September 30, 2018. On May 2, 2018, Charles Myers, the Company’s Chief Executive Officer, President and member of the Board resigned from all positions with the Company, effective immediately, to pursue other opportunities. The Board accepted Mr. Myers resignation on May 2, 2018. Mr. Myer’s decision to resign was not related to a disagreement with the Company over any of its operations, policies, or practices. In connection with his resignation, Mr. Myers, upon a general release of claims as set forth in his employment agreement, received a lump sum cash payment in the amount of $484,000; a lump sum cash payment in the amount of $3,200 covering twelve months of monthly premiums for disability insurance under the Company’s disability insurance plan; a lump sum cash payment in the amount of $20,000 covering certain other employment benefits; the acceleration of all his unvested options for a total of 283,000 shares and the continuation of his health coverage pursuant to COBRA at the Company’s expense for a period of twelve months following his last day of employment. In connection with Mr. Myers’ resignation, the Company recognized stock compensation expense of $1.2 million and Mr. Myer’s costs were included in general and administrative expense on the unaudited condensed statements of operations for the nine months ended September 30, 2018. As of September 30, 2019, there were no further amounts owed to Mr. Myers. On April 2, 2018, Glenn Selbo, the Company’s Chief Operating Officer, resigned from his position with the Company. Following his resignation, Mr. Selbo began providing consulting services to the Company. Mr. Selbo’s outstanding stock options continued to vest until the termination of his consulting services in March 2019. In connection with his resignation, Mr. Selbo, upon a general release of claims as set forth in his employment agreement, received a lump sum cash payment in the amount of $150,000 and the continuation of his health coverage pursuant to COBRA at the Company’s expense for a period of six months following his last day of employment. Mr. Selbo’s costs were included in sales and marketing expense on the unaudited condensed statements of operations for the nine months ended September 30, 2018.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and applicable rules and regulations of the Securities and Exchange Commission (SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Interim financial results are not necessarily indicative of results anticipated for the full year. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, from which the balance sheet information herein was derived. The unaudited condensed balance sheet as of December 31, 2018, included herein was derived from the audited financial statements as of that date but does not include all disclosures including notes required by GAAP. The unaudited condensed statements of operations for the three and nine months ended September 30, 2019 and 2018, and the balance sheet data as of September 30, 2019, have been prepared on the same basis as the audited financial statements. In the opinion of management, the accompanying unaudited condensed financial statements reflect all adjustments, consisting of normal and recurring adjustments, necessary for a fair presentation of results of the Company’s operations and financial position for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2019, or for any future period.
Segment Information	Segment Information The Company’s operations are located primarily in the United States and most of its assets are located in San Diego, California and Scottsdale, Arizona. The Company operates in one segment related to the sale of antenna products. The Company’s chief operating decision-maker is its chief executive officer, who reviews operating results on an aggregate basis and manages the Company’s operations as a single operating segment.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include valuation of intangible assets and goodwill.
Reclassifications	Reclassifications Certain amounts in the prior period financial statements have been reclassified to conform to the presentation of the current period financial statements.
Fair Value Measurements	Fair Value Measurements The carrying values of the Company’s financial instruments, including cash and cash equivalents, trade accounts receivable, accounts payable, and accrued liabilities approximate their fair values due to the short maturity of these instruments. Fair value measurements are market-based measurements, not entity-specific measurements. Therefore, fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. The Company follows a three-level hierarchy to prioritize the inputs used in the valuation techniques to derive fair values. The basis for fair value measurements for each level within the hierarchy is described below: • Level 1: Quoted prices in active markets for identical assets or liabilities. • Level 2: Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. • Level 3: Valuations derived from valuation techniques in which one or more significant inputs are unobservable in active markets.
Cash Equivalents and Short Term Investments	Cash Equivalents and Short-Term Investments Cash equivalents are comprised of short-term, highly liquid investments with maturities of 90 days or less at the date of purchase. Short-term investments consist predominantly of commercial paper, corporate debt securities, U.S. Treasury securities and asset backed securities. The Company classifies short-term investments based on the facts and circumstances surrounding the investments at the time of purchase and evaluates such classification as of each balance sheet date. All short-term investments are classified as available-for-sale securities as of September 30, 2019, and are recorded at estimated fair value. Unrealized gains and losses for available-for-sale securities are included in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are included in other income, in the unaudited condensed statements of operations. The Company evaluates its investments to determine whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered to be other than temporary if they are related to deterioration in credit risk or if it is likely that the Company will sell the securities before recovery of their cost basis.
Inventory	Inventory The majority of the Company’s products are manufactured by third parties that retain ownership of the inventory until title is transferred to the customer at the shipping point. In certain instances, shipping terms are delivery at place and the Company is responsible for arranging transportation and delivery of goods ready for unloading at the named place. The Company bears all risk involved in bringing the goods to the named place and records the related inventory in transit to the customer as inventory on the accompanying balance sheet. The Company also manufactures certain of its products at its facility located in Scottsdale, Arizona. Inventory is stated at the lower of cost or net realizable value. For items manufactured by the Company, cost is determined using the weighted average cost method. For items manufactured by third parties, cost is determined using the first-in, first-out (FIFO) method. Any adjustments to reduce the cost of inventories to their net realizable value are recognized in earnings in the current period. As of September 30, 2019, the Company’s inventories consist primarily of raw materials. Provisions for excess and obsolete inventories are estimated based on product life cycles, quality issues, and historical experience. As of September 30, 2019, there is no provision for excess and obsolete inventories.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Comprehensive income (loss) is comprised of net income (loss) and other comprehensive income (loss). Accumulated other comprehensive income (loss) on the unaudited condensed balance sheet at September 30, 2019, includes unrealized gains and losses on the Company’s available-for-sale securities.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15, Intangibles – Goodwill and Other – Internal-Use Software In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which simplifies the test for goodwill impairment by removing Step 2 which requires a hypothetical purchase price allocation and may require the services of valuation experts. An entity will, therefore, perform the goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, recognizing an impairment charge for the amount by which the carrying amount exceeds the fair value, not to exceed the total amount of goodwill allocated to the reporting unit. An entity still has the option to perform a qualitative assessment to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective for the Company in annual periods beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021, with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has not yet determined whether it will early adopt ASU 2017-04 and is evaluating the impact the standard will have on its ongoing financial reporting. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments In May 2019, the FASB issued ASU 2019-05, Financial Instruments-Credit Losses (Topic 326), Targeted Transition Relief

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Summary of Computation of Net Income (Loss) Per Share	The following table presents the computation of net income (loss) per share (in thousands except per share data) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net income (loss) $ (135 ) $ 437 $ 863 $ (3,858 ) Denominator: Weighted average common shares outstanding - basic 9,711 9,566 9,678 9,495 Plus dilutive effect of potential common shares — 527 405 — Weighted average common shares outstanding - diluted 9,711 10,093 10,083 9,495 Net income (loss) per share: Basic $ (0.01 ) $ 0.05 $ 0.09 $ (0.41 ) Diluted $ (0.01 ) $ 0.04 $ 0.09 $ (0.41 )
Summary of Potentially Dilutive Securities	Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because to do so would be anti-dilutive are as follows (in thousands) Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Employee stock options 721 245 457 887 Warrants outstanding 51 51 — 51 Total 772 296 457 938

Cash, Cash Equivalents and Sh_2

Cash, Cash Equivalents and Short-Term Investments (Tables)	9 Months Ended
	Sep. 30, 2019
Cash And Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents and Short-Term Investments by Significant Investment Category	The following tables show the Company’s cash and cash equivalents and short-term investments by significant investment category as of September 30, 2019 and December 31, 2018 (in thousands) September 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 2,968 $ — $ — $ 2,968 $ 2,968 $ — Level 1 (1) Money market funds 6,903 — — 6,903 6,903 — U.S. treasury securities 3,855 4 — 3,859 — 3,859 Subtotal 10,758 4 — 10,762 6,903 3,859 Level 2 (2) Commercial paper 9,641 — — 9,641 — 9,641 Corporate debt obligations 3,740 6 — 3,746 — 3,746 Repurchase agreements 3,000 — — 3,000 3,000 — Asset-backed securities 3,752 3 — 3,755 — 3,755 Subtotal 20,133 9 — 20,142 3,000 17,142 Total $ 33,859 $ 13 — $ 33,872 $ 12,871 $ 21,001 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Cash and Cash Equivalents Short-Term Investments Cash $ 3,044 $ — $ — $ 3,044 $ 3,044 $ — Level 1 (1) Money market funds 5,482 — — 5,482 5,482 — U.S. treasury securities 1,988 — — 1,988 — 1,988 Subtotal 7,470 — — 7,470 5,482 1,988 Level 2 (2) Commercial paper 10,639 — — 10,639 2,095 8,544 Corporate debt obligations 5,964 — (7 ) 5,957 — 5,957 Repurchase agreements 3,000 — — 3,000 3,000 — Asset-backed securities 3,682 — (2 ) 3,680 — 3,680 Subtotal 23,285 — (9 ) 23,276 5,095 18,181 Total $ 33,799 — $ (9 ) $ 33,790 $ 13,621 $ 20,169 (1) Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities. (2) Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Schedule of Contractual Maturities of Short-term Investments	Contractual maturities of short-term investments as of September 30, 2019, are as follows (in thousands)

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment	Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to fifteen years for all other property and equipment. Property and equipment consist of the following (in thousands) September 30, 2019 December 31, 2018 Computers and software $ 496 $ 361 Furniture, fixtures, and equipment 375 339 Manufacturing and testing equipment 3,083 2,503 Leasehold improvements 907 895 4,861 4,098 Less accumulated depreciation (3,070 ) (2,697 ) $ 1,791 $ 1,401

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Acquired Intangible Assets	The following is a summary of the Company’s acquired intangible assets (dollars in thousands) Weighted Average Amortization Period (years) Gross Carrying Amount Accumulated Amortization Intangibles, Net September 30, 2019 Customer relationships 10 $ 4,830 $ 1,599 $ 3,231 Developed technologies 9 1,080 374 706 Tradename 3 120 96 24 Total intangible assets, net $ 6,030 $ 2,069 $ 3,961 December 31, 2018 Customer relationships 10 $ 4,830 $ 1,237 $ 3,593 Developed technologies 9 1,080 274 806 Tradename 3 120 67 53 Total intangible assets, net $ 6,030 $ 1,578 $ 4,452
Schedule of Estimated Annual Amortization of Intangible Assets	The estimated annual amortization of intangible assets for the next five years and thereafter is shown in the following table (in thousands) Estimated Future Amortization 2019 (remaining three months) $ 164 2020 628 2021 598 2022 563 2023 563 Thereafter 1,445 Total $ 3,961

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2019
Class Of Stock Disclosures [Abstract]
Schedule of Common Stock Reserved for Future Issuance	The following common stock (in thousands) ( 1) September 30, 2019 December Warrants issued and outstanding 51 51 Stock option awards issued and outstanding 1,866 1,407 Authorized for grants under the 2016 Equity Incentive Plan 145 (2) 464 Authorized for grants under the 2016 Employee Stock Purchase Plan 186 (3) 100 2,248 2,022 (1) (2) (3)

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Outstanding Stock Option Activity	The following table summarizes the outstanding stock option activity during the periods indicated (shares in thousands) Weighted average Number of shares Exercise price Remaining contractual term (years) Balance at December 31, 2018 1,407 $ 8.73 Granted 770 11.79 Exercised (148 ) 4.59 Expired/Forfeited (163 ) 11.36 Balance at September 30, 2019 1,866 $ 10.09 8.1 Vested and exercisable at September 30, 2019 756 $ 8.38 6.6 Vested and expected to vest at September 30, 2019 1,866 $ 10.09 8.1

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Operating Leases	The future minimum lease payments required under operating leases in effect at September 30, 2019, were as follows (in thousands) Year ending: 2019 (remaining three months) $ 290 2020 854 2021 387 2022 104 2023 72 2024 34 $ 1,741

Concentration of Credit Risk (T

Concentration of Credit Risk (Tables)	9 Months Ended
	Sep. 30, 2019
Risks And Uncertainties [Abstract]
Schedule of Concentration of Sales and Accounts Receivable	The following represents customers that accounted for 10% or more of total revenue during the three and nine months ended September 30, 2019 and 2018, and customers that accounted for 10% or more of total trade accounts receivable at September 30, 2019 and 2018. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Percentage of net revenue Customer A 34% 38% 38% 35% Customer B 18 9 14 8 Customer C 10 0 6 8 As of September 30, 2019 2018 Percentage of gross trade accounts receivable Customer A 38% 24% Customer B 15 0 Customer C 13 7
Schedule of Revenue by Geographic area	Net revenue by geographic area are as follows. Revenue is attributed by geographic location based on the bill-to location of the Company’s customers. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Percentage of net revenue China 71% 79% 72% 73% Other Asia 2 5 4 6 North America 25 13 21 16 Europe 2 3 3 5

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of operating segments	1

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Computation of Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income (loss)	$ (135)	$ 437	$ 863	$ (3,858)
Denominator:
Basic	9,711	9,566	9,678	9,495
Plus dilutive effect of potential common shares		527	405
Weighted average common shares outstanding - diluted	9,711	10,093	10,083	9,495
Net income (loss) per share:
Basic	$ (0.01)	$ 0.05	$ 0.09	$ (0.41)
Diluted	$ (0.01)	$ 0.04	$ 0.09	$ (0.41)

Net Income (Loss) Per Share - A

Net Income (Loss) Per Share - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income (Loss) Per Share [Line Items]
Diluted weighted average common shares outstanding	9,711,000	10,093,000	10,083,000	9,495,000
Warrant
Net Income (Loss) Per Share [Line Items]
Diluted weighted average common shares outstanding			3,000
Options Outstanding
Net Income (Loss) Per Share [Line Items]
Diluted weighted average common shares outstanding			402,000

Net Income (Loss) Per Share -_2

Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	772	296	457	938
Employee Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	721	245	457	887
Warrants outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the calculation of diluted net loss per share	51	51		51

Cash, Cash Equivalents and Sh_3

Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash and Cash Equivalents and Short-term Investments by Significant Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 2,968	$ 3,044
Short term investments Gross Unrealized Gains	13
Short term investments Gross Unrealized Losses		(9)
Short term investments	21,001	20,169
Cash and cash equivalents and Short term investments, Amortized Cost	33,859	33,799
Cash and cash equivalents and Short term investments, Estimated Fair Value	33,872	33,790
Cash and cash equivalents	12,871	13,621
Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Gains	4
Cash equivalents and Short term investments, Estimated Fair Value	10,762	7,470
Cash equivalents and Short term investments, Amortized Cost	10,758	7,470
Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short term investments Gross Unrealized Gains	9
Short term investments Gross Unrealized Losses		(9)
Short term investments	17,142	18,181
Cash equivalents and Short term investments, Estimated Fair Value	20,142	23,276
Cash and cash equivalents	3,000	5,095
Cash equivalents and Short term investments, Amortized Cost	20,133	23,285
Money Market Funds | Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	6,903	5,482
Repurchase Agreements | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	3,000	3,000
US Treasury Securities | Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	3,855	1,988
Short term investments Gross Unrealized Gains	4
Short term investments	3,859	1,988
Commercial Paper | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents		2,095
Short Term Investments Amortized Cost	9,641	10,639
Short term investments	9,641	8,544
Cash equivalents and Short term investments, Estimated Fair Value	9,641	10,639
Corporate Debt Securities | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	3,740	5,964
Short term investments Gross Unrealized Gains	6
Short term investments Gross Unrealized Losses		(7)
Short term investments	3,746	5,957
Asset-backed Securities | Level 2
Cash And Cash Equivalents And Short Term Investments [Line Items]
Short Term Investments Amortized Cost	3,752	3,682
Short term investments Gross Unrealized Gains	3
Short term investments Gross Unrealized Losses		(2)
Short term investments	3,755	3,680
Cash equivalents and Short term investments, Estimated Fair Value	$ 3,755	$ 3,680

Cash, Cash Equivalents and Sh_4

Cash, Cash Equivalents and Short-Term Investments - Schedule of Contractual Maturities of Short-term Investments (Details) $ in Thousands	Sep. 30, 2019USD ($)
Investments Debt And Equity Securities [Abstract]
Due within one year	$ 21,001

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Property Plant And Equipment [Line Items]
Depreciation expense	$ 105,000	$ 156,000	$ 373,000	$ 423,000
Tenant Improvement | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life			6 years
Tenant Improvement | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life			10 years
Property and Equipment, Other Types | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life			3 years
Property and Equipment, Other Types | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, estimated useful Life			15 years

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,861	$ 4,098
Less accumulated depreciation	(3,070)	(2,697)
Property and equipment, net	1,791	1,401
Computers and software
Property Plant And Equipment [Line Items]
Property and equipment, gross	496	361
Furniture, fixtures, and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	375	339
Manufacturing and testing equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,083	2,503
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 907	$ 895

Intangible Assets - Summary of

Intangible Assets - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,030	$ 6,030
Accumulated Amortization	2,069	1,578
Intangibles, Net	$ 3,961	$ 4,452
Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	10 years	10 years
Gross Carrying Amount	$ 4,830	$ 4,830
Accumulated Amortization	1,599	1,237
Intangibles, Net	$ 3,231	$ 3,593
Developed technologies
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	9 years	9 years
Gross Carrying Amount	$ 1,080	$ 1,080
Accumulated Amortization	374	274
Intangibles, Net	$ 706	$ 806
Tradename
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (years)	3 years	3 years
Gross Carrying Amount	$ 120	$ 120
Accumulated Amortization	96	67
Intangibles, Net	$ 24	$ 53

Intangible Assets - Schedule of

Intangible Assets - Schedule of Estimated Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2019 (remaining three months)	$ 164
2020	628
2021	598
2022	563
2023	563
Thereafter	1,445
Intangibles, Net	$ 3,961	$ 4,452

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization	$ 163,000	$ 169,000	$ 491,000	$ 508,000

Notes Payable and Line of Cre_2

Notes Payable and Line of Credit - Additional Information (Details) - USD ($)	1 Months Ended		9 Months Ended
	Jan. 31, 2018	Dec. 31, 2015	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Silicon Valley Bank | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit facility allowable amount	$ 10,000,000				$ 3,000,000
Line of credit			$ 0	$ 0
Line of credit facility borrowing base limitation percentage of eligible receivables	80.00%
Liquidity ratio	125.00%
Interest rate fixed percentage	$ 3,000
Line of credit facility floating rate not met	2.00%		5.00%
Line of credit facility maturity date			Jan. 31, 2020
Silicon Valley Bank | Revolving Credit Facility | The Wall Street Journal Prime Rate
Line Of Credit Facility [Line Items]
Basis spread on variable interest rate	1.00%		5.00%
Line Of Credit Facility Interest Rate Description			The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.0% as of September 30, 2019) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.25 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.0% as of September 30, 2019) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020.
Silicon Valley Bank | Revolving Credit Facility | Prime Rate
Line Of Credit Facility [Line Items]
Liquidity ratio	125.00%
Silicon Valley Bank | Revolving Credit Facility | U.S. Prime Rate
Line Of Credit Facility [Line Items]
Basis spread on variable interest rate	1.25%
Loan Agreement With Silicon Valley Bank
Line Of Credit Facility [Line Items]
Loan agreement amount		$ 4,000,000
Term of payments		36 months
Date of maturity		Dec. 1, 2018
Interest rate fixed percentage		5.00%

Treasury Stock - Additional Inf

Treasury Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 07, 2018	Sep. 09, 2019	Aug. 31, 2017	Sep. 30, 2019	Sep. 30, 2019
Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Common stock repurchase, value				$ 3.6	$ 3.6
Common Stock | Share Repurchase Program August 2017
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value			$ 7
Period of stock repurchase program			12 months
Additional period of stock repurchase program	12 months
Common Stock | Share Repurchase Program September 9, 2019
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value		$ 7
Period of stock repurchase program		12 months
Common Stock | Share Repurchase Program August 2017 and September 2019
Equity Class Of Treasury Stock [Line Items]
Stock repurchase, shares				48,000	63,000
Stock repurchase, average price per share				$ 12.54	$ 12.75
Stock repurchase, cost				$ 0.6	$ 0.8

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	16.10%	(2.90%)
U.S. federal statutory tax rate	21.00%	21.00%

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Sep. 30, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common stock, reserved for future issuance	2,248,000	2,022,000
Warrants Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	51,000	51,000
Stock Option Awards Issued and Outstanding
Class Of Stock [Line Items]
Common stock, reserved for future issuance	1,866,000	1,407,000
Authorized for Grants under the 2016 Equity Incentive Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	145,000	464,000
Authorized for grants under the 2016 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock, reserved for future issuance	186,000	100,000

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details) - shares	Jan. 01, 2019	Sep. 30, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Treasury stock, shares at cost		420,000	357,000
2016 Equity Incentive Plan
Class Of Stock [Line Items]
Number of authorized shares increased	384,045
2016 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Number of authorized shares increased	96,000

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Outstanding Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of shares, Beginning balance | shares	1,407,000
Number of shares, Granted | shares	770,000
Number of shares, Exercised | shares	(148,000)
Number of shares, Expired/Forfeited | shares	(163,000)
Number of shares, Ending balance | shares	1,866,000
Number of shares, Vested and exercisable | shares	756,000
Number of shares, Vested and expected to vest | shares	1,866,000
Weighted average exercise price, Beginning balance | $ / shares	$ 8.73
Weighted average exercise price, Granted | $ / shares	11.79
Weighted average exercise price, Exercised | $ / shares	4.59
Weighted average exercise price, Expired/Forfeited | $ / shares	11.36
Weighted average exercise price, Ending balance | $ / shares	10.09
Weighted average exercise price, Vested and exercisable | $ / shares	8.38
Weighted average exercise price, Vested and expected to vest | $ / shares	$ 10.09
Weighted average remaining contractual term (years)	8 years 1 month 6 days
Weighted average remaining contractual term (years), Vested and exercisable	6 years 7 months 6 days
Weighted average remaining contractual term (years), Vested and expected to vest	8 years 1 month 6 days

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of options granted		$ 4.18	$ 3.97
Stock options vested aggregate intrinsic value		$ 3,043,000	$ 2,485,000
Stock options expected to vest aggregate intrinsic value		$ 935,000	993,000
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Offering period of employee stock purchase plan		6 months
Terms of stock purchase plane		The ESPP is implemented through consecutive 6-month offering periods commencing on March 1 and September 1 of each year.
Limited percentage of annual contribution		20.00%
Percentage of discount and fair value of option		15.00%
Proceeds from stock issued during period	$ 97,000
Number of stock issued during period	10,000
Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price percentage of market value of common stock		85.00%
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost		$ 4,090,000	$ 2,781,000
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the Company's equity plans, period for recognition		3 years
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost		$ 919,000
Restricted stock outstanding		96,605,000
Weighted average grant date fair value		$ 11.42
Restricted stock granted		95,478,000
Weighted average price, grant date value		$ 11.35
Restricted stock vested		0
Weighted average remaining contractual term		1 year 9 months 18 days

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - Office Space and Research Facilities Lease - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Commitment And Contingencies [Line Items]
Operating leases, rent expense	$ 239,000	$ 220,000	$ 729,000	$ 687,000
Lease agreement description			The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company.
Lease expiration date			Jun. 30, 2024
Maximum
Commitment And Contingencies [Line Items]
Payments for tenant improvements allowance			$ 515,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Operating Leases (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Future minimum lease payment
2019 (remaining three months)	$ 290
2020	854
2021	387
2022	104
2023	72
2024	34
Total future minimum lease payment	$ 1,741

Concentration of Credit Risk -

Concentration of Credit Risk - Additional Information (Details) - Vendor	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
China
Concentration Risk [Line Items]
Number of vendors	2		2
Customer Concentration Risk | Net Revenue
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Customer Concentration Risk | Net Revenue | China
Concentration Risk [Line Items]
Concentration risk percentage	71.00%	79.00%	72.00%	73.00%
Customer Concentration Risk | Trade Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%

Concentration of Credit Risk _2

Concentration of Credit Risk - Schedule of Concentration of Sales and Accounts Receivable (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Revenue
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Net Revenue | Customer A
Concentration Risk [Line Items]
Concentration risk percentage	34.00%	38.00%	38.00%	35.00%
Net Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk percentage	18.00%	9.00%	14.00%	8.00%
Net Revenue | Customer C
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	0.00%	6.00%	8.00%
Trade Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Trade Accounts Receivable | Customer A
Concentration Risk [Line Items]
Concentration risk percentage			38.00%	24.00%
Trade Accounts Receivable | Customer B
Concentration Risk [Line Items]
Concentration risk percentage			15.00%	0.00%
Trade Accounts Receivable | Customer C
Concentration Risk [Line Items]
Concentration risk percentage			13.00%	7.00%

Concentration of Credit Risk _3

Concentration of Credit Risk - Schedule of Revenue by Geography (Details) - Customer Concentration Risk - Net Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
China
Concentration Risk [Line Items]
Concentration risk percentage	71.00%	79.00%	72.00%	73.00%
Other Asia
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	5.00%	4.00%	6.00%
North America
Concentration Risk [Line Items]
Concentration risk percentage	25.00%	13.00%	21.00%	16.00%
Europe
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	3.00%	3.00%	5.00%

Termination Costs - Additional

Termination Costs - Additional Information (Details) - USD ($)	Jun. 30, 2018	May 02, 2018	Apr. 02, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Stock compensation expense				$ 1,605,000	$ 2,536,000
Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Unvested options shares		283,000
Number of monthly premiums for disability insurance		12 months
Remaining amount payable				$ 0
Mr. Charles Myers | One Time Benefit
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 484,000
Mr. Charles Myers | Other Employment Benefits
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		20,000
Mr. Charles Myers | Disability Insurance Plan
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash		$ 3,200
Mr. Selbo
Restructuring Cost And Reserve [Line Items]
Severance amount paid in cash			$ 150,000
Sales and Marketing Expense
Restructuring Cost And Reserve [Line Items]
Agreement termination costs	$ 1,300,000
General and Administrative Expense | Mr. Charles Myers
Restructuring Cost And Reserve [Line Items]
Stock compensation expense					$ 1,200,000