ServiceSource International (SREV) 10-Q 7 Aug 19 2019 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-35108
Entity Registrant Name	SERVICESOURCE INTERNATIONAL, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-0578975
Entity Address, Address Line One	707 17th Street,
Entity Address, Address Line Two	25th Floor
Entity Address, City or Town	Denver,
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80202
City Area Code	(720)
Local Phone Number	889-8500
Title of 12(b) Security	Common Stock, $0.0001 Par Value
Trading Symbol	SREV
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Small Business	false
Emerging Growth Company	false
Entity Shell Company	false
Entity Common stock, shares outstanding		94,082,381
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001310114
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 25,652	$ 26,535
Accounts receivable, net	42,933	54,284
Prepaid expenses and other	6,704	5,653
Total current assets	75,289	86,472
Property and equipment, net	37,029	36,593
Contract acquisition costs	2,041	2,660
Right-of-use assets	33,190
Goodwill	6,334	6,334
Other assets	4,801	4,521
Total assets	158,684	136,580
Current liabilities:
Accounts payable	2,096	2,424
Accrued expenses	2,673	3,380
Accrued compensation and benefits	14,735	15,509
Operating lease liabilities	8,419
Other current liabilities	5,690	6,894
Total current liabilities	33,613	28,207
Operating lease liabilities, net of current portion	28,684
Other long-term liabilities	3,537	6,540
Total liabilities	65,834	34,747
Commitments and Contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000 shares authorized and none issued and outstanding	0	0
Common stock; $0.0001 par value; 1,000,000 shares authorized; 94,210 shares issued and 94,089 shares outstanding as of June 30, 2019; 92,895 shares issued and 92,774 shares outstanding as of December 31, 2018	9	9
Treasury stock	(441)	(441)
Additional paid-in capital	372,201	369,246
Accumulated deficit	(279,137)	(267,383)
Accumulated other comprehensive income	218	402
Total stockholders’ equity	92,850	101,833
Total liabilities and stockholders’ equity	$ 158,684	$ 136,580

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	94,210,000	92,895,000
Common stock, shares outstanding (in shares)	94,089,000	92,774,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net revenue	$ 52,358	$ 61,111	$ 107,869	$ 119,696
Cost of revenue	38,349	42,463	77,825	84,187
Gross profit	14,009	18,648	30,044	35,509
Operating expenses:
Sales and marketing	7,486	9,252	15,435	18,490
Research and development	1,274	1,780	2,537	3,296
General and administrative	10,970	13,157	21,952	26,046
Restructuring and other related costs	148	156	1,206
Restructuring charges				209
Total operating expenses	19,878	24,345	41,130	48,041
Loss from operations	(5,869)	(5,697)	(11,086)	(12,532)
Interest and other expense, net	(58)	(2,776)	(548)	(5,622)
Impairment loss on investment securities	0	0	0	(1,958)
Loss before income taxes	(5,927)	(8,473)	(11,634)	(20,112)
Provision for income tax expense	(108)	(414)	(120)	(427)
Net loss	$ (6,035)	$ (8,887)	$ (11,754)	$ (20,539)
Net loss per common share
Basic and diluted (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.13)	$ (0.23)
Weighted-average common shares outstanding:
Basic and diluted (in shares)	93,712	91,323	93,315	90,843

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (6,035)	$ (8,887)	$ (11,754)	$ (20,539)
Other comprehensive (loss) income
Net change in available for sale debt securities	0	5	0	1,258
Foreign currency translation adjustments	(260)	(210)	(184)	64
Other comprehensive (loss) income	(260)	(205)	(184)	1,322
Comprehensive loss	(6,295)	(9,092)	(11,938)	(19,217)
Parent
Other comprehensive (loss) income
Unrealized gain (loss) on short-term investments	0	5	0	(700)
Reclassification adjustment for impairment loss included in net loss	$ 0	$ 0	$ 0	$ 1,958

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Shares/Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of ASC 606 - initial adoption	$ 3,709				$ 3,709
Stockholders' equity, adjusted balance	115,818	$ 8	$ (441)	$ 359,347	(242,498)	$ (598)
Beginning balance (in shares) at Dec. 31, 2017		90,380	(121)
Stockholders' equity, beginning balance at Dec. 31, 2017	112,109	$ 8	$ (441)	359,347	(246,207)	(598)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,652)				(11,652)
Other comprehensive income	1,527					1,527
Stock-based compensation	3,223			3,223
Issuance of common stock, restricted stock units (in shares)		84
Issuance of common stock, restricted stock units	0
Proceeds from the exercise of stock options and employee stock purchase plan (in shares)		119
Proceeds from the exercise of stock options and employee stock purchase plan	353			353
Net cash paid for payroll taxes on restricted stock unit releases	(53)			(53)
Ending balance (in shares) at Mar. 31, 2018		90,583	(121)
Stockholders' equity, ending balance at Mar. 31, 2018	109,216	$ 8	$ (441)	362,870	(254,150)	929
Beginning balance (in shares) at Dec. 31, 2017		90,380	(121)
Stockholders' equity, beginning balance at Dec. 31, 2017	112,109	$ 8	$ (441)	359,347	(246,207)	(598)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,539)
Ending balance (in shares) at Jun. 30, 2018		91,822	(121)
Stockholders' equity, ending balance at Jun. 30, 2018	103,379	$ 8	$ (441)	366,125	(263,037)	724
Beginning balance (in shares) at Mar. 31, 2018		90,583	(121)
Stockholders' equity, beginning balance at Mar. 31, 2018	109,216	$ 8	$ (441)	362,870	(254,150)	929
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,887)				(8,887)
Other comprehensive income	(205)					(205)
Stock-based compensation	3,525			3,525
Issuance of common stock, restricted stock units (in shares)		1,207
Issuance of common stock, restricted stock units	0
Proceeds from the exercise of stock options and employee stock purchase plan (in shares)		32
Proceeds from the exercise of stock options and employee stock purchase plan	94			94
Net cash paid for payroll taxes on restricted stock unit releases	(364)			(364)
Ending balance (in shares) at Jun. 30, 2018		91,822	(121)
Stockholders' equity, ending balance at Jun. 30, 2018	103,379	$ 8	$ (441)	366,125	(263,037)	724
Beginning balance (in shares) at Dec. 31, 2018		92,895	(121)
Stockholders' equity, beginning balance at Dec. 31, 2018	101,833	$ 9	$ (441)	369,246	(267,383)	402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,719)				(5,719)
Other comprehensive income	76					76
Stock-based compensation	1,564			1,564
Issuance of common stock, restricted stock units (in shares)		229
Issuance of common stock, restricted stock units	0
Proceeds from the exercise of stock options and employee stock purchase plan (in shares)		139
Proceeds from the exercise of stock options and employee stock purchase plan	141			141
Ending balance (in shares) at Mar. 31, 2019		93,263	(121)
Stockholders' equity, ending balance at Mar. 31, 2019	97,895	$ 9	$ (441)	370,951	(273,102)	478
Beginning balance (in shares) at Dec. 31, 2018		92,895	(121)
Stockholders' equity, beginning balance at Dec. 31, 2018	101,833	$ 9	$ (441)	369,246	(267,383)	402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,754)
Ending balance (in shares) at Jun. 30, 2019		94,210	(121)
Stockholders' equity, ending balance at Jun. 30, 2019	92,850	$ 9	$ (441)	372,201	(279,137)	218
Beginning balance (in shares) at Mar. 31, 2019		93,263	(121)
Stockholders' equity, beginning balance at Mar. 31, 2019	97,895	$ 9	$ (441)	370,951	(273,102)	478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,035)				(6,035)
Other comprehensive income	(260)					(260)
Stock-based compensation	1,269			1,269
Issuance of common stock, restricted stock units (in shares)		947
Issuance of common stock, restricted stock units	0
Net cash paid for payroll taxes on restricted stock unit releases	(19)			(19)
Ending balance (in shares) at Jun. 30, 2019		94,210	(121)
Stockholders' equity, ending balance at Jun. 30, 2019	$ 92,850	$ 9	$ (441)	$ 372,201	$ (279,137)	$ 218

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (11,754)	$ (20,539)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	6,994	9,744
Amortization of debt discount and issuance costs	38	4,923
Amortization of contract acquisition costs	868	930
Amortization of premium on short-term investments	0	(1,197)
Amortization of right-of-use assets	4,725	0
Stock-based compensation	2,806	6,538
Restructuring and other related costs	1,166	482
Impairment loss on investment securities	0	1,958
Other	0	56
Accounts receivable, net	11,328	5,593
Prepaid expenses and other assets	(898)	(434)
Contract acquisition costs	(249)	(878)
Accounts payable	(263)	(2,515)
Accrued compensation and benefits	(1,934)	(1,647)
Operating lease liabilities	(4,767)
Accrued expenses	(797)	(1,811)
Other liabilities	(546)	1,199
Net cash provided by operating activities	6,717	2,402
Cash flows from investing activities:
Acquisition of property and equipment	(6,095)	(7,268)
Purchases of short-term investments	0	(480)
Sales of short-term investments	0	133,920
Maturities of short-term investments	0	4,240
Net cash (used in) provided by investing activities	(6,095)	130,412
Cash flows from financing activities:
Repayment on finance lease obligations	(421)	(156)
Proceeds from issuance of common stock	141	447
Payments related to minimum tax withholdings on restricted stock unit releases	(19)	(417)
Net cash used in financing activities	(299)	(126)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(156)	243
Net change in cash and cash equivalents and restricted cash	167	132,931
Cash and cash equivalents and restricted cash, beginning of period	27,779	52,633
Cash and cash equivalents and restricted cash, end of period	27,946	185,564
Supplemental disclosures of cash flow information:
Cash paid for interest	136	1,178
Supplemental disclosures of non-cash activities:
Acquisition of property and equipment accrued in accounts payable and accrued expenses	419	389
ASU 2014-09
Supplemental disclosures of non-cash activities:
Increase in contract acquisition costs and benefit to accumulated deficit related to adoption of ASC 606	0	3,346
Increase in prepaid expenses and other, other liabilities and benefit to accumulated deficit related to adoption of ASC 606	0	$ 363
ASU 2016-02
Supplemental disclosures of non-cash activities:
Increase in operating lease liabilities related to the adoption of ASC 842	41,760
Increase in right-of-use assets related to the adoption of ASC 842	39,183
Decrease in prepaids and other assets related to the adoption of ASC 842	(749)
Decrease in other liabilities related to the adoption of ASC 842	$ (3,308)

The Company

The Company	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
The Company	The Company ServiceSource International, Inc. is a global leader in outsourced, performance-based customer success and revenue growth solutions. Through our people, processes and technology, we grow and retain revenue on behalf of our clients — some of the world’s leading business-to-business companies — in more than 45 languages. Our solutions help our clients strengthen their customer relationships, drive improved customer adoption, expansion and retention and minimize churn. Our technology platform and best-practice business processes combined with our highly-trained, client-focused revenue delivery professionals and data from 20 years of operating experience enable us to provide our clients greater value for our customer success services than attained by our clients' in-house customer success teams. “ServiceSource,” “the Company,” “we,” “us,” or “our”, as used herein, refer to ServiceSource International, Inc. and its wholly-owned subsidiaries, unless the context indicates otherwise. The Company’s pay-for-performance model allows its clients to pay for the services through either flat-rate or variable commissions based on the revenue generated by the Company on their behalf. Fixed-fee arrangements are typically used in quick deployments to address discrete target areas of our clients’ needs. The Company also earns revenue through its professional services teams, who assist clients with data optimization. The Company’s corporate headquarters is located in Denver, Colorado. The Company has additional U.S. offices in California and Tennessee, and international offices in Bulgaria, Ireland, Japan, Malaysia, Philippines, Singapore and the United Kingdom.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying interim unaudited Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and with the instructions to Form 10-Q and Article 10 of Regulation S-X for interim financial information. Accordingly, these financial statements do not include all the information required by GAAP for annual financial statements. The unaudited Consolidated Balance Sheet as of December 31, 2018 has been derived from the Company’s audited annual Consolidated Financial Statements included in our annual report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission on February 28, 2019 . In the opinion of management, these Consolidated Financial Statements reflect all adjustments, including normal recurring adjustments, management considers necessary for a fair presentation of the Company’s financial position, operating results, and cash flows for the interim periods presented. These Consolidated Financial Statements and accompanying notes should be read in conjunction with our audited Consolidated Financial Statements and the notes thereto for the year ended December 31, 2018 , included in our annual report on Form 10-K. Interim results are not necessarily indicative of results for the entire year. Principles of Consolidation The accompanying unaudited interim Consolidated Financial Statements include the accounts of ServiceSource International, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amount of net revenue and expenses during the reporting period. The Company’s significant accounting judgments and estimates include, but are not limited to: revenue recognition, the valuation and recognition of stock-based compensation, the recognition and measurement of current and deferred income tax assets and liabilities and uncertain tax positions, the provision for bad debts and impairment of goodwill and long-lived assets. The Company bases its estimates and judgments on historical experience and on various assumptions that it believes are reasonable under the circumstances. However, future events are subject to change and estimates and judgments routinely require adjustment. Actual results and outcomes may differ from our estimates. Reclassifications Certain items on the Consolidated Statements of Cash Flows for the six months ended June 30, 2018 have been reclassified to conform to the current year presentation. These reclassifications did not affect the Company's Consolidated Balance Sheet as of December 31, 2018 or the Company's Consolidated Statements of Operations, Consolidated Statements of Comprehensive Loss or Consolidated Statements of Stockholders' Equity for the six months ended June 30, 2018 . New Accounting Standards Issued but Not yet Adopted Financial Instruments - Credit Losses In June 2016, the Financial Accounting Standard Board ("FASB") issued an Accounting Standard Update ("ASU") that amends the measurement of credit losses on financial instruments and requires measurement and recognition of expected versus incurred credit losses for financial assets held. In November 2018, the FASB issued an update to this ASU clarifying receivables arising from operating leases are accounted for using the lease guidance in Accounting Standards Codification Topic 842 Leases ("ASC 842"), and not as financial instruments. This ASU is effective for annual periods and interim periods for those annual periods beginning after December 15, 2019, with early adoption permitted. This standard will apply to the Company's trade receivables. Based on our current analysis the Company does not expect the adoption to have a material impact on its Consolidated Financial Statements as credit losses associated from trade receivables have historically been insignificant. The Company will adopt this standard effective January 1, 2020. New Accounting Standards Adopted Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires the recognition of assets and liabilities arising from lease transactions on the balance sheet and will also require significant additional disclosures about the amount, timing, and uncertainty of cash flows from leases. Substantially all leases, including current operating leases, will be recognized by lessees on their balance sheet as a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. ASU 2016-02 initially required entities to adopt the standard using a modified retrospective transition method. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) Targeted Improvements, which provide transition practical expedients allowing companies to adopt the new standard with a cumulative effect adjustment as of the beginning of the year of adoption with prior year comparative financial information and disclosures remaining as previously reported. The Company adopted this standard effective January 1, 2019 and elected the package of practical expedients, accounting for leases with contractual terms less than 12 months as short-term leases and the transition relief option to apply legacy GAAP to periods prior to the standard’s effective date. Upon initial adoption of the standard, the Company recorded a $29.5 million right-of-use asset ("ROU") and a $32.1 million operating lease liability to the Consolidated Balance Sheets as of January 1, 2019. Cloud Computing Implementation Costs In August 2018, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326) that provides guidance on the accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The accounting for the service element of a hosting arrangement that is a service contract is not affected by the new standard. This ASU is effective for annual periods and interim periods for those annual periods beginning after December 15, 2019, with early adoption permitted. The Company early adopted this standard effective January 1, 2019 and the effects of this standard were applied prospectively to eligible costs incurred on or after January 1, 2019. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements. New Accounting Policies upon Adoption of ASC 842 Leases At the inception of a contract, the Company determines whether the contract is or contains a lease. ROU assets represent the Company's right to use an underlying asset over the lease term and lease liabilities represent our remaining payment obligation under the lease. ROU assets and liabilities are recognized upon the lease commencement based on the present value of lease payments over the lease term. ROU assets are adjusted for any prepaid or accrued lease payments and unamortized lease incentives or initial direct costs. As most of the Company's leases do not provide an implicit rate, the Company uses an incremental borrowing rate, the variable interest rate on the revolving line of credit (the “Revolver”), and other information available at the lease commencement in determining the present value of lease payments. The Company's lease terms include options to extend or terminate the lease when it is reasonably certain it will exercise the option. Leases with an initial term of 12 months or less are not recorded on the balance sheet. Lease expense and sublease income is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which are accounted for separately. See “ Note 6 — Leases” for additional information.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company follows a three-tier fair value hierarchy, which is described in detail in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 . There were no transfers between levels during the six months ended June 30, 2019 and 2018 . Cash equivalents consist of highly liquid investments with original maturities of three months or less at the time of purchase. Cash and cash equivalents are classified within Level 1. Short-term investments consist of readily marketable debt securities with a remaining maturity of more than three months from the time of purchase. The Company liquidated its investment securities during the first half of 2018 to repay the $150.0 million convertible notes that matured August 1, 2018. Based on the Company’s decision to sell these investment securities, an other-than-temporary impairment occurred and a $2.0 million impairment loss was recorded in the Consolidated Statements of Operations for the six months ended June 30, 2018 . The Company recognized realized gains from the sale of available-for-sale securities of $0.03 million for the three and six months ended June 30, 2018 and losses from the sale of available-for-sale securities of $0.2 million for the three and six months ended June 30, 2018 . Gains and losses on available-for-sale securities are recorded in "Interest and other expense, net" in the Consolidated Statements of Operations. The Company had restricted cash in "Other assets" in the Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018 of $2.3 million and $1.2 million , respectively. Restricted cash is classified within Level 1.

Other Current and Long-Term Lia

Other Current and Long-Term Liabilities	6 Months Ended
	Jun. 30, 2019
Other Liabilities Disclosure [Abstract]
Other Current and Long-Term Liabilities	Other Current and Long-Term Liabilities Other current liabilities were comprised of the following: June 30, 2019 December 31, 2018 (in thousands) Legal reserve $ 3,730 $ 3,750 Finance lease obligations 959 954 Contract liability 549 873 Other liabilities 201 198 Employee stock purchase plan withholdings 251 384 Deferred rent — 735 Total $ 5,690 $ 6,894 Other long-term liabilities were comprised of the following: June 30, 2019 December 31, 2018 (in thousands) Asset retirement obligations $ 1,397 $ 1,368 Finance lease obligations 1,142 1,510 Accrued restructuring costs 593 716 Deferred tax liability 289 268 Other accrued costs 116 105 Deferred rent — 2,573 Total $ 3,537 $ 6,540

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	Debt Revolving Line of Credit In July 2018 , the Company entered into a $40.0 million senior secured Revolver that allows us to borrow against our domestic receivables as defined in the credit agreement. The Revolver matures July 2021 and bears interest at a variable rate per annum based on the greater of the prime rate, the Federal Funds rate plus 0.50% or the one-month LIBOR rate plus 1.00% , plus, in each case, a margin of 1.00% for base rate borrowings or 2.00% for Eurodollar borrowings. As of June 30, 2019 , the Company did not have any borrowings outstanding on the Revolver and therefore has no future obligations. The obligations under the credit agreement are secured by substantially all assets of the borrowers and certain of their subsidiaries, including pledges of equity in certain of the Company’s subsidiaries. The Revolver has covenants with which the Company was in compliance as of June 30, 2019 and December 31, 2018 . Deferred Debt Issuance Costs Discounts and premiums to the principal amounts are included in the carrying value of debt and amortized to "Interest and other expense, net" over the remaining life of the underlying debt. Unamortized debt issuance costs related to the Revolver were $0.1 million and $0.2 million as of June 30, 2019 and December 31, 2018 , respectively. The amortization of all premiums and discounts related to the convertible notes that matured August 2018 was $2.3 million and $4.5 million for the three and six months ended June 30, 2018 , respectively. Interest expense related to the amortization of debt issuance costs, interest expense associated with the Company's debt obligations and accretion of the Company's debt discount was $0.04 million and $3.1 million for the three months ended June 30, 2019 and 2018 , respectively, and $0.1 million and $6.0 million for the six months ended June 30, 2019 and 2018 , respectively.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases The Company has operating leases for office space and finance leases for certain equipment under non-cancelable agreements with various expiration dates through April 2030. Certain office leases include the option to extend the term between three to seven years and certain office leases include the option to terminate the lease upon written notice within one to eight years after lease commencement. Leases with an initial term of 12 months or less are not recorded on the balance sheet. In January 2018, the Company entered into a sublease with a third-party for the San Francisco office space through the remaining term of the lease of November 30, 2022. The Company recognizes rent expense and sublease income on a straight-line basis over the lease period and accrues for rent expense and sublease income incurred but not paid. Rent expense for the three and six months ended June 30, 2018 was $3.1 million and $5.8 million , respectively. Rent income for the three and six months ended June 30, 2018 was $0.5 million and $0.6 million , respectively. Supplemental income statement information related to leases was as follows: For the Three Months Ended June 30, 2019 For the Six Months Ended June 30, 2019 (in thousands) Operating lease cost $ 3,116 $ 5,997 Finance lease cost: Amortization of leased assets 171 322 Interest on lease liabilities 45 86 Total finance lease cost 216 408 Sublease income (468 ) (936 ) Net lease cost $ 2,864 $ 5,469 Supplemental balance sheet information related to leases was as follows: June 30, 2019 (in thousands) Operating leases: Right-of-use assets $ 33,190 Operating lease liabilities $ 8,419 Operating lease liabilities, net of current portion 28,684 Total operating lease liabilities $ 37,103 Finance leases: Property and equipment $ 3,479 Accumulated depreciation (1,463 ) Property and equipment, net $ 2,016 Other current liabilities $ 959 Other long-term liabilities 1,142 Total finance lease liabilities $ 2,101 Lease term and discount rate information related to leases was as follows: June 30, 2019 Weighted-average remaining lease term (in years): Operating lease 5.0 Finance lease 2.3 Weighted-average discount rate: Operating lease 6.5 % Finance lease 8.2 % Maturities of lease liabilities were as follows as of June 30, 2019 : Operating Leases Operating Sublease Finance Leases (in thousands) Remainder of 2019 $ 4,882 $ (942 ) $ 555 2020 11,030 (1,932 ) 1,040 2021 10,562 (1,989 ) 633 2022 7,126 (1,878 ) 64 2023 2,218 — — Thereafter 8,769 — — Total lease payments 44,587 (6,741 ) 2,292 Less: interest (6,828 ) — (191 ) Less: tenant improvements reimbursement (656 ) — — Total $ 37,103 $ (6,741 ) $ 2,101 Subsequent to June 30, 2019 , the Company entered into a sublease agreement with a third party for the San Francisco office space through the remaining term of the lease, November 30, 2023 , with total sublease income of approximately $2.8 million
Leases	Leases The Company has operating leases for office space and finance leases for certain equipment under non-cancelable agreements with various expiration dates through April 2030. Certain office leases include the option to extend the term between three to seven years and certain office leases include the option to terminate the lease upon written notice within one to eight years after lease commencement. Leases with an initial term of 12 months or less are not recorded on the balance sheet. In January 2018, the Company entered into a sublease with a third-party for the San Francisco office space through the remaining term of the lease of November 30, 2022. The Company recognizes rent expense and sublease income on a straight-line basis over the lease period and accrues for rent expense and sublease income incurred but not paid. Rent expense for the three and six months ended June 30, 2018 was $3.1 million and $5.8 million , respectively. Rent income for the three and six months ended June 30, 2018 was $0.5 million and $0.6 million , respectively. Supplemental income statement information related to leases was as follows: For the Three Months Ended June 30, 2019 For the Six Months Ended June 30, 2019 (in thousands) Operating lease cost $ 3,116 $ 5,997 Finance lease cost: Amortization of leased assets 171 322 Interest on lease liabilities 45 86 Total finance lease cost 216 408 Sublease income (468 ) (936 ) Net lease cost $ 2,864 $ 5,469 Supplemental balance sheet information related to leases was as follows: June 30, 2019 (in thousands) Operating leases: Right-of-use assets $ 33,190 Operating lease liabilities $ 8,419 Operating lease liabilities, net of current portion 28,684 Total operating lease liabilities $ 37,103 Finance leases: Property and equipment $ 3,479 Accumulated depreciation (1,463 ) Property and equipment, net $ 2,016 Other current liabilities $ 959 Other long-term liabilities 1,142 Total finance lease liabilities $ 2,101 Lease term and discount rate information related to leases was as follows: June 30, 2019 Weighted-average remaining lease term (in years): Operating lease 5.0 Finance lease 2.3 Weighted-average discount rate: Operating lease 6.5 % Finance lease 8.2 % Maturities of lease liabilities were as follows as of June 30, 2019 : Operating Leases Operating Sublease Finance Leases (in thousands) Remainder of 2019 $ 4,882 $ (942 ) $ 555 2020 11,030 (1,932 ) 1,040 2021 10,562 (1,989 ) 633 2022 7,126 (1,878 ) 64 2023 2,218 — — Thereafter 8,769 — — Total lease payments 44,587 (6,741 ) 2,292 Less: interest (6,828 ) — (191 ) Less: tenant improvements reimbursement (656 ) — — Total $ 37,103 $ (6,741 ) $ 2,101 Subsequent to June 30, 2019 , the Company entered into a sublease agreement with a third party for the San Francisco office space through the remaining term of the lease, November 30, 2023 , with total sublease income of approximately $2.8 million

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letter of Credit In connection with two of our leased facilities, the Company is required to maintain two letters of credit totaling $2.3 million . The letters of credit are secured by $2.3 million of cash in money market accounts, which are classified as restricted cash in "Other assets" in our Consolidated Balance Sheets. Litigation The Company is subject to various legal proceedings and claims arising in the ordinary course of our business, including the cases discussed below. Although the results of litigation and claims cannot be predicted with certainty, the Company is currently not aware of any litigation or threats of litigation in which the final outcome could have a material adverse effect on our business, operating results, financial position or cash flows. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. The Company records a contingent liability when it is probable that a loss has been incurred and the amount is reasonably estimable in accordance with accounting for contingencies. As of June 30, 2019 and December 31, 2018 , the Company accrued a $3.7 million and $3.8 million , respectively, reserve relating to our potential liability for currently pending disputes, reflected in "Other current liabilities" in the Consolidated Balance Sheets. On August 23, 2016, the United States District Court for the Middle District of Tennessee granted conditional class certification in a lawsuit originally filed on September 21, 2015 by three former senior sales representatives. The lawsuit, Sarah Patton, et al v. ServiceSource Delaware, Inc., asserts a claim under the Fair Labor Standards Act alleging that certain non-exempt employees in our Nashville location were not paid for all hours worked and were not properly paid for overtime hours worked. The complaint also asserts claims under Tennessee state law for breach of contract and unjust enrichment; and, on September 28, 2018, the plaintiffs filed a motion to certify the state law breach of contract and unjust enrichment claims as a class action. A settlement of all claims has been reached and the settlement amounts will be paid in phases. The Company anticipates settlement payments will be completed by the end of 2019. Non-cancelable Service Contract Commitments Future minimum payments under non-cancelable service contract commitments were as follows: June 30, 2019 (in thousands) Remainder of 2019 $ 3,886 2020 9,091 2021 7,986 2022 7,431 2023 8,237 Thereafter — Total $ 36,631

Revenues, Contract Asset and Li

Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs	Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs The following tables present the disaggregation of revenue from contracts with our clients: Revenue by Performance Obligation For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Professional services $ 442 $ 692 $ 825 $ 2,699 Selling services 51,916 60,419 107,044 116,997 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696 Revenue by Geography For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) APJ $ 9,345 $ 9,255 $ 18,019 $ 16,849 EMEA 13,418 14,669 27,054 30,191 NALA 29,595 37,187 62,796 72,656 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696 Revenue by Contract Pricing For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Fixed consideration $ 18,828 $ 20,683 $ 38,557 $ 38,425 Variable consideration 33,530 40,428 69,312 81,271 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696 Contract Balances Once the Company obtains a client contract, the timing of satisfying performance obligations and the receipt of client consideration can be different and will give rise to contract assets and contract liabilities. As of June 30, 2019 and December 31, 2018 , the contract asset balance totaled $0.1 million and $0.2 million , respectively, and the contract liability balance totaled $0.5 million and $0.9 million , respectively. Contract assets and contract liabilities are reflected in "Prepaid expenses and other", "Other assets" and "Other current liabilities" in the Consolidated Balance Sheets. Transaction Price Allocated to Remaining Performance Obligations The Company maintains contracts with fixed consideration that are generally with long-standing client relationships and typically renew annually. Assuming none of the Company’s current contracts with fixed consideration are renewed, we estimate receiving approximately $42.5 million in future selling services fixed consideration as of June 30, 2019 . Professional services revenues from fixed consideration are based on proportional performance which is typically concluded within 90 days of contract execution. The Company typically bills professional services upfront upon obtaining a client contract. As of June 30, 2019 , we estimate $0.2 million in professional services fixed consideration revenue to be recognized through the remainder of 2019 . Contract Acquisition Costs Certain commissions paid to the Company's sales team upon obtaining a client contract are incremental and recoverable, and capitalized as contract acquisition costs. Under the transition guidance, the Company recorded a $3.3 million contract acquisition asset and corresponding offset to the opening accumulated deficit balance related to previously expensed sales commissions. The Company expensed $1.5 million of the $3.3 million of contract acquisition asset during 2018 and will expense the remainder of the asset over the next five years as follows: $0.4 million remaining in 2019 , $0.6 million in 2020 and $0.3 million in 2021 and beyond. The Company recorded $0.2 million and $0.5 million , respectively, in amortization expense for the three and six months ended June 30, 2019 and $0.4 million and $0.8 million , respectively, of amortization for the three and six months ended June 30, 2018 related to amounts capitalized upon the adoption of ASC 606. Subsequent to the adoption of ASC 606, the Company capitalized an additional $0.2 million and $1.1 million as of June 30, 2019 and December 31, 2018 , respectively, of sales commissions as contract acquisition costs related to contracts obtained during the period. The Company recorded amortization expense of $0.3 million and $0.4 million , respectively, for the three and six months ended June 30, 2019 and $0.1 million for the three and six months ended June 30, 2018 related to the amounts capitalized. As of June 30, 2019 , the weighted-average remaining amortization period related to these capitalized costs was approximately 2.4 years. Impairment recognized on contract costs was insignificant for the three and six months ended June 30, 2019 and 2018 . Applying the practical expedient for amortization periods one year or less, the Company recognizes any incremental costs of obtaining contracts as expense when the cost is incurred. These costs are included in "Sales and marketing" in the Consolidated Statements of Operations.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Stockholders' Equity	Stockholders' Equity Stock-Based Compensation Expense The following table presents stock-based compensation expense as allocated within the Company's Consolidated Statements of Operations: For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Cost of revenue $ 129 $ 279 $ 288 $ 558 Sales and marketing 429 833 872 1,719 Research and development 18 58 12 122 General and administrative 660 2,257 1,634 4,139 Total stock-based compensation $ 1,236 $ 3,427 $ 2,806 $ 6,538 The above table does not include capitalized stock-based compensation related to internal-use software of $0.03 million for the three and six months ended June 30, 2019 and $0.1 million and $0.2 million for the three and six months ended June 30, 2018 , respectively. Stock Awards Issued to Employees The following table summarizes information related to stock options: Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Life (Years) Intrinsic Value (in thousands) (in thousands) Outstanding as of December 31, 2018 7,516 $ 3.34 $ — Granted 182 $ 1.03 Expired and/or forfeited (3,589 ) $ 4.17 Outstanding as of June 30, 2019 4,109 $ 2.51 7.89 $ — Exercisable as of June 30, 2019 1,232 $ 5.17 4.46 $ — The weighted-average fair value of options granted during the six months ended June 30, 2019 and 2018 was $0.51 and $1.84 , respectively. As of June 30, 2019 , there was $1.7 million of unrecognized compensation expense related to stock options granted under the 2011 Equity Incentive Plan (the "2011 Plan"), which is expected to be recognized over a weighted-average period of 2.7 years. The following table summarizes information related to restricted stock units and performance-based restricted stock units: Units Weighted-Average Grant Date Fair Value (in thousands) Non-vested as of December 31, 2018 5,669 $ 3.29 Granted 325 $ 1.03 Vested (1) (1,195 ) $ 3.78 Forfeited (995 ) $ 3.79 Non-vested as of June 30, 2019 3,804 $ 2.81 (1) 1,175 thousand shares of common stock were issued for restricted stock units vested and the remaining 20 thousand shares were withheld for taxes. As of June 30, 2019 , there was $8.6 million of unrecognized compensation expense related to non-vested restricted stock units and performance-based restricted stock units granted under the 2011 Plan, which is expected to be recognized over a weighted-average period of 2.4 years. Potential shares of common stock that are not included in the determination of diluted net loss per share because they are anti-dilutive for the periods presented consist of stock options, unvested restricted stock and shares to be purchased under our 2011 Employee Stock Purchase Plan. The Company excluded from diluted earnings per share the weighted-average common share equivalents related to 7.6 million and 5.1 million shares for the three months ended June 30, 2019 and 2018 , respectively, and 8.9 million and 5.7 million shares for the six months ended June 30, 2019 and 2018 , respectively, because their effect would have been anti-dilutive.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to taxation in the U.S. and various state and foreign jurisdictions. Earnings from non-U.S. activities are subject to local country income tax. The Company computes its quarterly income tax provision by using a forecasted annual effective tax rate and adjusts for any discrete items arising during the quarter. The primary difference between the effective tax rate and the federal statutory tax rate relates to the valuation allowances on the Company’s net operating losses and foreign tax rate differences. The "Provision for income tax expense" in the Consolidated Statements of Operations primarily consist of income and withholding taxes for foreign and state jurisdictions where the Company has profitable operations, as well as valuation allowance adjustments for certain U.S. tax jurisdictions. No tax benefit was provided for losses incurred in the U.S., Ireland and Singapore because those losses are offset by a full valuation allowance. The tax years 2011 through 2019 generally remain subject to examination by federal, state and foreign tax authorities. The gross amount of the Company’s unrecognized tax benefits was $1.0 million and $0.9 million as of June 30, 2019 and December 31, 2018 , respectively, none of which, if recognized, would affect the Company’s effective tax rate. The Company does not expect its unrecognized tax benefits to change significantly over the next 12 months. The Company recognizes interest and penalties accrued related to unrecognized tax benefits in income tax expense. During the three and six months ended June 30, 2019 and 2018 , interest and penalties recognized were insignificant.

Restructuring and Other Related

Restructuring and Other Related Costs	6 Months Ended
	Jun. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Other Related Costs	Restructuring and Other Related Costs The Company has undergone restructuring efforts to better align its cost structure with business and market conditions. These restructuring efforts included severance and other employee costs, lease and other contract termination costs and asset impairments. Severance and other employee costs include severance payments, related employee benefits, stock-based compensation related to the accelerated vesting of certain equity awards and employee-related legal fees. Lease and other contract termination costs include charges related to lease consolidation and abandonment of spaces no longer utilized and the cancellation of certain contracts with outside vendors. Asset impairments include charges related to leasehold improvements and furniture in spaces vacated or no longer in use. The restructuring plans and future cash outlays are recorded in "Accrued expenses", "Accrued compensation and benefits" and "Other long-term liabilities" in our Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018 . In February 2019, the Company announced a restructuring effort to better align its cost structure with current business and market conditions, resulting in a headcount reduction. The Company recognized charges related to this restructuring effort of $0.1 million and $1.2 million for the three and six months ended June 30, 2019 , respectively, and expects to incur additional costs through September 2019. The following table presents a reconciliation of the beginning and ending fair value liability balance related to the February 2019 restructuring effort: Severance and Other Employee Costs (in thousands) Balance as of January 1, 2019 $ — Restructuring and other related costs 1,167 Cash paid (1,117 ) Balance as of June 30, 2019 $ 50 In May 2017 , the Company announced a restructuring effort to better align its cost structure with current business and market conditions, including a headcount reduction and the reduction of office space in four locations. The Company recognized charges related to this restructuring effort of $0.04 million for the three and six months ended June 30, 2019 and $0.2 million for the three and six months ended June 30, 2018 . The Company does not expect to incur additional restructuring charges related to the May 2017 restructuring as of June 30, 2019 . The following table presents a reconciliation of the beginning and ending fair value liability balance related to the May 2017 restructuring effort: Severance and Other Employee Costs Lease and Other Contract Termination Costs Asset Impairments Total (in thousands) Balance as of January 1, 2017 $ — $ — $ — $ — Restructuring and other related costs 3,483 2,939 886 7,308 Cash paid (3,060 ) (1,185 ) — (4,245 ) Change in estimates and non-cash charges — — (886 ) (886 ) Acceleration of stock-based compensation expense in additional paid-in capital (352 ) — — (352 ) Balance as of December 31, 2017 71 1,754 — 1,825 Restructuring and other related costs 120 89 — 209 Cash paid (188 ) (1,133 ) — (1,321 ) Change in estimates and non-cash charges (3 ) 252 — 249 Balance as of December 31, 2018 — 962 — 962 Restructuring and other related costs — 39 39 Cash paid — (93 ) — (93 ) Change in estimates and non-cash charges — (40 ) — (40 ) Balance as of June 30, 2019 $ — $ 868 $ — $ 868

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim unaudited Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and with the instructions to Form 10-Q and Article 10 of Regulation S-X for interim financial information. Accordingly, these financial statements do not include all the information required by GAAP for annual financial statements. The unaudited Consolidated Balance Sheet as of December 31, 2018 has been derived from the Company’s audited annual Consolidated Financial Statements included in our annual report on Form 10-K for the year ended December 31, 2018 filed with the Securities and Exchange Commission on February 28, 2019 . In the opinion of management, these Consolidated Financial Statements reflect all adjustments, including normal recurring adjustments, management considers necessary for a fair presentation of the Company’s financial position, operating results, and cash flows for the interim periods presented. These Consolidated Financial Statements and accompanying notes should be read in conjunction with our audited Consolidated Financial Statements and the notes thereto for the year ended December 31, 2018
Principles of Consolidation	Principles of Consolidation The accompanying unaudited interim Consolidated Financial Statements include the accounts of ServiceSource International, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amount of net revenue and expenses during the reporting period. The Company’s significant accounting judgments and estimates include, but are not limited to: revenue recognition, the valuation and recognition of stock-based compensation, the recognition and measurement of current and deferred income tax assets and liabilities and uncertain tax positions, the provision for bad debts and impairment of goodwill and long-lived assets. The Company bases its estimates and judgments on historical experience and on various assumptions that it believes are reasonable under the circumstances. However, future events are subject to change and estimates and judgments routinely require adjustment. Actual results and outcomes may differ from our estimates.
Reclassifications	Reclassifications Certain items on the Consolidated Statements of Cash Flows for the six months ended June 30, 2018 have been reclassified to conform to the current year presentation. These reclassifications did not affect the Company's Consolidated Balance Sheet as of December 31, 2018 or the Company's Consolidated Statements of Operations, Consolidated Statements of Comprehensive Loss or Consolidated Statements of Stockholders' Equity for the six months ended June 30, 2018 .
New Accounting Standards Issued but Not yet Adopted and New Accounting Standards Adopted	New Accounting Standards Issued but Not yet Adopted Financial Instruments - Credit Losses In June 2016, the Financial Accounting Standard Board ("FASB") issued an Accounting Standard Update ("ASU") that amends the measurement of credit losses on financial instruments and requires measurement and recognition of expected versus incurred credit losses for financial assets held. In November 2018, the FASB issued an update to this ASU clarifying receivables arising from operating leases are accounted for using the lease guidance in Accounting Standards Codification Topic 842 Leases ("ASC 842"), and not as financial instruments. This ASU is effective for annual periods and interim periods for those annual periods beginning after December 15, 2019, with early adoption permitted. This standard will apply to the Company's trade receivables. Based on our current analysis the Company does not expect the adoption to have a material impact on its Consolidated Financial Statements as credit losses associated from trade receivables have historically been insignificant. The Company will adopt this standard effective January 1, 2020. New Accounting Standards Adopted Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires the recognition of assets and liabilities arising from lease transactions on the balance sheet and will also require significant additional disclosures about the amount, timing, and uncertainty of cash flows from leases. Substantially all leases, including current operating leases, will be recognized by lessees on their balance sheet as a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. ASU 2016-02 initially required entities to adopt the standard using a modified retrospective transition method. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842) Targeted Improvements, which provide transition practical expedients allowing companies to adopt the new standard with a cumulative effect adjustment as of the beginning of the year of adoption with prior year comparative financial information and disclosures remaining as previously reported. The Company adopted this standard effective January 1, 2019 and elected the package of practical expedients, accounting for leases with contractual terms less than 12 months as short-term leases and the transition relief option to apply legacy GAAP to periods prior to the standard’s effective date. Upon initial adoption of the standard, the Company recorded a $29.5 million right-of-use asset ("ROU") and a $32.1 million operating lease liability to the Consolidated Balance Sheets as of January 1, 2019. Cloud Computing Implementation Costs In August 2018, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326) that provides guidance on the accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The accounting for the service element of a hosting arrangement that is a service contract is not affected by the new standard. This ASU is effective for annual periods and interim periods for those annual periods beginning after December 15, 2019, with early adoption permitted. The Company early adopted this standard effective January 1, 2019 and the effects of this standard were applied prospectively to eligible costs incurred on or after January 1, 2019. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements.
Leases	Leases At the inception of a contract, the Company determines whether the contract is or contains a lease. ROU assets represent the Company's right to use an underlying asset over the lease term and lease liabilities represent our remaining payment obligation under the lease. ROU assets and liabilities are recognized upon the lease commencement based on the present value of lease payments over the lease term. ROU assets are adjusted for any prepaid or accrued lease payments and unamortized lease incentives or initial direct costs. As most of the Company's leases do not provide an implicit rate, the Company uses an incremental borrowing rate, the variable interest rate on the revolving line of credit (the “Revolver”), and other information available at the lease commencement in determining the present value of lease payments. The Company's lease terms include options to extend or terminate the lease when it is reasonably certain it will exercise the option. Leases with an initial term of 12 months or less are not recorded on the balance sheet. Lease expense and sublease income is recognized on a straight-line basis over the lease term.

Other Current and Long-Term L_2

Other Current and Long-Term Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities were comprised of the following: June 30, 2019 December 31, 2018 (in thousands) Legal reserve $ 3,730 $ 3,750 Finance lease obligations 959 954 Contract liability 549 873 Other liabilities 201 198 Employee stock purchase plan withholdings 251 384 Deferred rent — 735 Total $ 5,690 $ 6,894
Schedule of Other Long-Term Liabilities	Other long-term liabilities were comprised of the following: June 30, 2019 December 31, 2018 (in thousands) Asset retirement obligations $ 1,397 $ 1,368 Finance lease obligations 1,142 1,510 Accrued restructuring costs 593 716 Deferred tax liability 289 268 Other accrued costs 116 105 Deferred rent — 2,573 Total $ 3,537 $ 6,540

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Summary of supplemental income statement information and other information	Supplemental income statement information related to leases was as follows: For the Three Months Ended June 30, 2019 For the Six Months Ended June 30, 2019 (in thousands) Operating lease cost $ 3,116 $ 5,997 Finance lease cost: Amortization of leased assets 171 322 Interest on lease liabilities 45 86 Total finance lease cost 216 408 Sublease income (468 ) (936 ) Net lease cost $ 2,864 $ 5,469 Lease term and discount rate information related to leases was as follows: June 30, 2019 Weighted-average remaining lease term (in years): Operating lease 5.0 Finance lease 2.3 Weighted-average discount rate: Operating lease 6.5 % Finance lease 8.2 %
Summary of supplemental balance sheet information	Supplemental balance sheet information related to leases was as follows: June 30, 2019 (in thousands) Operating leases: Right-of-use assets $ 33,190 Operating lease liabilities $ 8,419 Operating lease liabilities, net of current portion 28,684 Total operating lease liabilities $ 37,103 Finance leases: Property and equipment $ 3,479 Accumulated depreciation (1,463 ) Property and equipment, net $ 2,016 Other current liabilities $ 959 Other long-term liabilities 1,142 Total finance lease liabilities $ 2,101
Summary of maturities of lease liabilities	Maturities of lease liabilities were as follows as of June 30, 2019 : Operating Leases Operating Sublease Finance Leases (in thousands) Remainder of 2019 $ 4,882 $ (942 ) $ 555 2020 11,030 (1,932 ) 1,040 2021 10,562 (1,989 ) 633 2022 7,126 (1,878 ) 64 2023 2,218 — — Thereafter 8,769 — — Total lease payments 44,587 (6,741 ) 2,292 Less: interest (6,828 ) — (191 ) Less: tenant improvements reimbursement (656 ) — — Total $ 37,103 $ (6,741 ) $ 2,101
Summary of maturities of lease liabilities	Maturities of lease liabilities were as follows as of June 30, 2019 : Operating Leases Operating Sublease Finance Leases (in thousands) Remainder of 2019 $ 4,882 $ (942 ) $ 555 2020 11,030 (1,932 ) 1,040 2021 10,562 (1,989 ) 633 2022 7,126 (1,878 ) 64 2023 2,218 — — Thereafter 8,769 — — Total lease payments 44,587 (6,741 ) 2,292 Less: interest (6,828 ) — (191 ) Less: tenant improvements reimbursement (656 ) — — Total $ 37,103 $ (6,741 ) $ 2,101

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Payments Under Non-cancelable Service Contract Commitments	Future minimum payments under non-cancelable service contract commitments were as follows: June 30, 2019 (in thousands) Remainder of 2019 $ 3,886 2020 9,091 2021 7,986 2022 7,431 2023 8,237 Thereafter — Total $ 36,631

Revenues, Contract Asset and _2

Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue From Contracts with Clients	The following tables present the disaggregation of revenue from contracts with our clients: Revenue by Performance Obligation For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Professional services $ 442 $ 692 $ 825 $ 2,699 Selling services 51,916 60,419 107,044 116,997 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696 Revenue by Geography For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) APJ $ 9,345 $ 9,255 $ 18,019 $ 16,849 EMEA 13,418 14,669 27,054 30,191 NALA 29,595 37,187 62,796 72,656 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696 Revenue by Contract Pricing For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Fixed consideration $ 18,828 $ 20,683 $ 38,557 $ 38,425 Variable consideration 33,530 40,428 69,312 81,271 Total revenue $ 52,358 $ 61,111 $ 107,869 $ 119,696

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Summary of Stock-Based Compensation Expense	The following table presents stock-based compensation expense as allocated within the Company's Consolidated Statements of Operations: For the Three Months Ended For the Six Months Ended 2019 2018 2019 2018 (in thousands) Cost of revenue $ 129 $ 279 $ 288 $ 558 Sales and marketing 429 833 872 1,719 Research and development 18 58 12 122 General and administrative 660 2,257 1,634 4,139 Total stock-based compensation $ 1,236 $ 3,427 $ 2,806 $ 6,538
Summary of Option and Restricted Stock Activity	The following table summarizes information related to stock options: Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Life (Years) Intrinsic Value (in thousands) (in thousands) Outstanding as of December 31, 2018 7,516 $ 3.34 $ — Granted 182 $ 1.03 Expired and/or forfeited (3,589 ) $ 4.17 Outstanding as of June 30, 2019 4,109 $ 2.51 7.89 $ — Exercisable as of June 30, 2019 1,232 $ 5.17 4.46 $ —
Summary of Additional Information Concerning Vested RSUs and PSUs	The following table summarizes information related to restricted stock units and performance-based restricted stock units: Units Weighted-Average Grant Date Fair Value (in thousands) Non-vested as of December 31, 2018 5,669 $ 3.29 Granted 325 $ 1.03 Vested (1) (1,195 ) $ 3.78 Forfeited (995 ) $ 3.79 Non-vested as of June 30, 2019 3,804 $ 2.81 (1) 1,175 thousand shares of common stock were issued for restricted stock units vested and the remaining 20 thousand shares were withheld for taxes.

Restructuring and Other Relat_2

Restructuring and Other Related Costs (Tables)	6 Months Ended
	Jun. 30, 2019
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Other Reserve Activities	The following table presents a reconciliation of the beginning and ending fair value liability balance related to the May 2017 restructuring effort: Severance and Other Employee Costs Lease and Other Contract Termination Costs Asset Impairments Total (in thousands) Balance as of January 1, 2017 $ — $ — $ — $ — Restructuring and other related costs 3,483 2,939 886 7,308 Cash paid (3,060 ) (1,185 ) — (4,245 ) Change in estimates and non-cash charges — — (886 ) (886 ) Acceleration of stock-based compensation expense in additional paid-in capital (352 ) — — (352 ) Balance as of December 31, 2017 71 1,754 — 1,825 Restructuring and other related costs 120 89 — 209 Cash paid (188 ) (1,133 ) — (1,321 ) Change in estimates and non-cash charges (3 ) 252 — 249 Balance as of December 31, 2018 — 962 — 962 Restructuring and other related costs — 39 39 Cash paid — (93 ) — (93 ) Change in estimates and non-cash charges — (40 ) — (40 ) Balance as of June 30, 2019 $ — $ 868 $ — $ 868 The following table presents a reconciliation of the beginning and ending fair value liability balance related to the February 2019 restructuring effort: Severance and Other Employee Costs (in thousands) Balance as of January 1, 2019 $ — Restructuring and other related costs 1,167 Cash paid (1,117 ) Balance as of June 30, 2019 $ 50

The Company (Details)

The Company (Details)	6 Months Ended
	Jun. 30, 2019language
Accounting Policies [Abstract]
Number of languages (more than)	45
Years of operating experience	20 years

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets	$ 33,190
Operating lease liability	$ (37,103)
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets		$ 29,500
Operating lease liability		$ (32,100)

Fair Value of Financial Instr_2

Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	Aug. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other-than-temporary impairment loss recorded in earnings		$ 0	$ 0	$ 0	$ 1,958
Realized gains			30		30
Realized losses			$ 200		$ 200
Other Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash		$ 2,300		$ 2,300		$ 1,200
Senior Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repayments of convertible debt	$ 150,000

Other Current and Long-Term L_3

Other Current and Long-Term Liabilities - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Legal reserve	$ 3,730	$ 3,750
Finance lease obligations	959
Finance lease obligations		954
Contract liability	549	873
Other liabilities	201	198
Employee stock purchase plan withholdings	251	384
Deferred rent		735
Total	$ 5,690	$ 6,894

Other Current and Long-Term L_4

Other Current and Long-Term Liabilities - Schedule of Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Asset retirement obligations	$ 1,397	$ 1,368
Finance lease obligations	1,142
Finance lease obligations		1,510
Accrued restructuring costs	593	716
Deferred tax liability	289	268
Other accrued costs	116	105
Deferred rent		2,573
Total	$ 3,537	$ 6,540

Debt - Narrative (Details)

Debt - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Deferred loan costs		$ 100,000		$ 100,000		$ 200,000
Amortization of premiums and discounts			$ 2,300,000		$ 4,500,000
Interest expense		$ 40,000	$ 3,100,000	$ 100,000	$ 6,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 40,000,000
Federal Funds rate | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread of interest rate	0.50%
LIBOR | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread of interest rate	1.00%
Base rate | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread of interest rate	1.00%
Eurodollar | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Basis spread of interest rate	2.00%

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 07, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Rent expense			$ 3,100		$ 5,800
Sublease income		$ (468)	$ (500)	$ (936)	$ (600)
Minimum
Lessee, Lease, Description [Line Items]
Option to extend, term (in years)		3 years		3 years
Option to terminate, term (in years)				1 year
Maximum
Lessee, Lease, Description [Line Items]
Option to extend, term (in years)		7 years		7 years
Option to terminate, term (in years)				8 years
Subsequent Event | San Francisco
Lessee, Lease, Description [Line Items]
Sublease income	$ (2,800)

Leases - Supplemental Income St

Leases - Supplemental Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 3,116		$ 5,997
Finance lease cost:
Amortization of leased assets	171		322
Interest on lease liabilities	45		86
Total finance lease cost	216		408
Sublease income	(468)	$ (500)	(936)	$ (600)
Net lease cost	$ 2,864		$ 5,469

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Jun. 30, 2019USD ($)
Operating leases:
Right-of-use assets	$ 33,190
Operating lease liabilities	8,419
Operating lease liabilities, net of current portion	28,684
Total operating lease liabilities	37,103
Finance leases:
Property and equipment	3,479
Accumulated depreciation	(1,463)
Property and equipment, net	2,016
Other current liabilities	959
Other long-term liabilities	1,142
Total finance lease liabilities	$ 2,101

Leases - Lease Term and Discoun

Leases - Lease Term and Discount Rate (Details)	Jun. 30, 2019
Weighted-average remaining lease term (in years):
Operating lease	5 years
Finance lease	2 years 3 months 18 days
Weighted-average discount rate:
Operating lease	6.50%
Finance lease	8.20%

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019USD ($)
Operating Leases
Remainder of 2019	$ 4,882
2020	11,030
2021	10,562
2022	7,126
2023	2,218
Thereafter	8,769
Total lease payments	44,587
Less: interest	(6,828)
Less: tenant improvements reimbursement	(656)
Total	37,103
Operating Sublease
Remainder of 2019	(942)
2020	(1,932)
2021	(1,989)
2022	(1,878)
2023	0
Thereafter	0
Total	(6,741)
Finance Leases
Remainder of 2019	555
2020	1,040
2021	633
2022	64
2023	0
Thereafter	0
Total lease payments	2,292
Less: interest	(191)
Less: tenant improvements reimbursement	0
Total	$ 2,101

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Thousands	Aug. 23, 2016plaintiff	Jun. 30, 2019USD ($)facilitydebt_instrument	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Operating Leased Assets [Line Items]
Number of leased facilities | facility		2
Number of letters of credit | debt_instrument		2
Restricted cash		$ 167	$ 132,931
Loss contingency accrual		3,730		$ 3,750
Sarah Patton, et al v. ServiceSource Delaware, Inc | Pending Litigation
Operating Leased Assets [Line Items]
Number of plaintiffs | plaintiff	3
Money market mutual funds | Letter of Credit
Operating Leased Assets [Line Items]
Letters of credit		2,300
Restricted cash		$ 2,300

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Payments Under Non-cancelable Service Contract Commitments (Details) $ in Thousands	Jun. 30, 2019USD ($)
Non-cancelable Service Contract Commitments
Remainder of 2019	$ 3,886
2020	9,091
2021	7,986
2022	7,431
2023	8,237
Thereafter	0
Total	$ 36,631

Revenues, Contract Asset and _3

Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 52,358	$ 61,111	$ 107,869	$ 119,696
Fixed consideration
Disaggregation of Revenue [Line Items]
Revenue	18,828	20,683	38,557	38,425
Variable consideration
Disaggregation of Revenue [Line Items]
Revenue	33,530	40,428	69,312	81,271
APJ
Disaggregation of Revenue [Line Items]
Revenue	9,345	9,255	18,019	16,849
EMEA
Disaggregation of Revenue [Line Items]
Revenue	13,418	14,669	27,054	30,191
NALA
Disaggregation of Revenue [Line Items]
Revenue	29,595	37,187	62,796	72,656
Professional services
Disaggregation of Revenue [Line Items]
Revenue	442	692	825	2,699
Selling services
Disaggregation of Revenue [Line Items]
Revenue	$ 51,916	$ 60,419	$ 107,044	$ 116,997

Revenues, Contract Asset and _4

Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract asset	$ 100,000		$ 100,000		$ 200,000
Contract liability	549,000		549,000		873,000
Amortization expense for the remainder of 2019			400,000
Amortization expense for 2020			600,000
Amortization expense for 2021 and beyond			300,000
Additional contract costs capitalized			$ 200,000		1,100,000
Amortization term			2 years 4 months 24 days
Impairment of contract costs	0	$ 0	$ 0	$ 0
ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract acquisition costs					3,300,000
Amortization of contract acquisition costs	200,000	400,000	500,000	800,000	$ 1,500,000
Selling services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation	42,500,000		42,500,000
After Adoption of New Revenue Guidance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of contract acquisition costs	$ 300,000	$ 100,000	$ 400,000	$ 100,000

Revenues, Contract Asset and _5

Revenues, Contract Asset and Liability Balances and Contract Acquisition Costs - Performance Obligations (Details) - Selling services $ in Millions	Jun. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 42.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 0.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, expected timing of satisfaction	6 months

Stockholders' Equity - Stock-Ba

Stockholders' Equity - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 1,236	$ 3,427	$ 2,806	$ 6,538
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	129	279	288	558
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	429	833	872	1,719
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	18	58	12	122
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 660	$ 2,257	$ 1,634	$ 4,139

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized stock-based compensation related to internal-use software	$ 30	$ 100	$ 30	$ 200
Antidilutive shares excluded from diluted earnings per share calculation (in shares)	7.6	5.1	8.9	5.7
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)			$ 0.51	$ 1.84
Employee Stock Option | The 2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, stock options	$ 1,700		$ 1,700
Unrecognized compensation expense, weighted-average period recognized			2 years 8 months 12 days
RSUs and PSUs | The 2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, weighted-average period recognized			2 years 4 months 24 days
Unrecognized compensation expense, RSUs and PSUs	$ 8,600		$ 8,600

Stockholders' Equity - Option A

Stockholders' Equity - Option Activity (Details) - Employee Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares
Options Outstanding, Number of Shares
Outstanding, beginning balance (in shares) | shares	7,516
Granted (in shares) | shares	182
Expired and/or forfeited (in shares) | shares	(3,589)
Outstanding, ending balance (in shares) | shares	4,109
Options exercisable (in shares) | shares	1,232
Options Outstanding, Options, Weighted Average Exercise Price
Outstanding, weighted average exercise price per share, beginning balance (in dollars per share) | $ / shares	$ 3.34
Granted, weighted average exercise price per share (in dollars per share) | $ / shares	1.03
Expired and/or Forfeited, weighted average exercise price per share (in dollars per share) | $ / shares	4.17
Outstanding, weighted average exercise price per share, ending balance (in dollars per share) | $ / shares	2.51
Options exercisable, weighted average option price per share (in dollars per share) | $ / shares	$ 5.17
Outstanding, weighted average remaining contractual life	7 years 10 months 20 days
Options exercisable, weighted average remaining contractual life	4 years 5 months 15 days
Outstanding, intrinsic value | $	$ 0
Options exercisable, intrinsic value | $	$ 0

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Unit Activity (Details) - RSUs and PSUs shares in Thousands	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Shares
Unvested, beginning balance (in shares)	5,669
Granted (in shares)	325
Vested (in shares)	(1,195)
Forfeited (in shares)	(995)
Unvested, ending balance (in shares)	3,804
Weighted-Average Grant Date Fair Value
Unvested, weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares	$ 3.29
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	1.03
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	3.78
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	3.79
Unvested, weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 2.81
Common stock, shares issued (in shares)	1,175
Shares withheld for taxes (in shares)	20

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 1	$ 0.9

Restructuring and Other Relat_3

Restructuring and Other Related Costs - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2017location	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 209
February 2019 Restructuring Effort
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 100		$ 1,200
May 2017 Restructuring Effort
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 40	$ 200	$ 39	$ 200	$ 209	$ 7,308
Number of locations where reduction of headcount and office spaces took place (location) | location	4

Restructuring and Other Relat_4

Restructuring and Other Related Costs - Restructuring and Other Reserve Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring and other related costs				$ 209
February 2019 Restructuring Effort
Restructuring Reserve [Roll Forward]
Restructuring and other related costs	$ 100		$ 1,200
February 2019 Restructuring Effort | Severance and Other Employee Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Restructuring and other related costs			1,167
Cash paid			(1,117)
Ending Balance	50		50		$ 0
May 2017 Restructuring Effort
Restructuring Reserve [Roll Forward]
Beginning Balance			962	1,825	1,825	$ 0
Restructuring and other related costs	40	$ 200	39	200	209	7,308
Cash paid			(93)		(1,321)	(4,245)
Change in estimates and non-cash charges			(40)		249	(886)
Acceleration of stock-based compensation expense in additional paid-in capital						(352)
Ending Balance	868		868		962	1,825
May 2017 Restructuring Effort | Severance and Other Employee Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			0	71	71	0
Restructuring and other related costs			0		120	3,483
Cash paid			0		(188)	(3,060)
Change in estimates and non-cash charges			0		(3)	0
Acceleration of stock-based compensation expense in additional paid-in capital						(352)
Ending Balance	0		0		0	71
May 2017 Restructuring Effort | Lease and Other Contract Termination Costs
Restructuring Reserve [Roll Forward]
Beginning Balance			962	1,754	1,754	0
Restructuring and other related costs			39		89	2,939
Cash paid			(93)		(1,133)	(1,185)
Change in estimates and non-cash charges			(40)		252	0
Acceleration of stock-based compensation expense in additional paid-in capital						0
Ending Balance	868		868		962	1,754
May 2017 Restructuring Effort | Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning Balance			0	$ 0	0	0
Restructuring and other related costs					0	886
Cash paid			0		0	0
Change in estimates and non-cash charges			0		0	(886)
Acceleration of stock-based compensation expense in additional paid-in capital						0
Ending Balance	$ 0		$ 0		$ 0	$ 0