Marin Software (MRIN) 10-K 14 Mar 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 25, 2019	Jun. 30, 2018
Document Information [Line Items]
Entity Registrant Name	Marin Software Incorporated
Entity Central Index Key	0001389002
Trading Symbol	mrin
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		5,944,000
Entity Public Float			$ 31.3
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 10,210,000	$ 27,544,000
Restricted cash	1,293,000	1,293,000
Accounts receivable, net	12,906,000	12,237,000
Prepaid expenses and other current assets	4,642,000	3,989,000
Total current assets	29,051,000	45,063,000
Property and equipment, net	11,815,000	15,559,000
Goodwill	1,943,000	16,768,000
Intangible assets, net	1,938,000	4,475,000
Other non-current assets	2,045,000	1,504,000
Total assets	46,792,000	83,369,000
Current liabilities
Accounts payable	2,699,000	2,826,000
Accrued expenses and other current liabilities	9,383,000	10,474,000
Capital lease obligations	1,249,000	1,416,000
Total current liabilities	13,331,000	14,716,000
Capital lease obligations, non-current	549,000	1,687,000
Other long-term liabilities	3,541,000	4,183,000
Total liabilities	17,421,000	20,586,000
Commitments and contingencies (Note 15)
Stockholders' equity
Convertible preferred stock, $0.001 par value - 10,000 shares authorized, no shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively
Common stock, $0.001 par value - 142,857 shares authorized, 5,938 and 5,729 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	6,000	6,000
Additional paid-in capital	295,116,000	291,163,000
Accumulated deficit	(264,713,000)	(227,704,000)
Accumulated other comprehensive loss	(1,038,000)	(682,000)
Total stockholders' equity	29,371,000	62,783,000
Total liabilities and stockholders' equity	$ 46,792,000	$ 83,369,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized (in shares)	10,000	10,000
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	142,857	142,857
Common stock, shares issued (in shares)	5,938	5,729
Common stock, shares outstanding (in shares)	5,938	5,729

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues, net	$ 58,631	$ 74,991	$ 99,878
Cost of revenues	27,154	32,520	35,203
Gross profit	31,477	42,471	64,675
Operating expenses
Sales and marketing	23,425	26,936	32,889
Research and development	22,450	26,564	27,841
General and administrative	13,113	16,444	19,890
Impairment of goodwill	14,740	2,797
Total operating expenses	73,728	72,741	80,620
Loss from operations	(42,251)	(30,270)	(15,945)
Other income, net	1,593	(214)	869
Loss before provision for income taxes	(40,658)	(30,484)	(15,076)
Provision for income taxes	(586)	(1,007)	(1,404)
Net loss	(41,244)	(31,491)	(16,480)
Foreign currency translation adjustments	(356)	2,205	(1,110)
Comprehensive loss	$ (41,600)	$ (29,286)	$ (17,590)
Net loss per share available to common stockholders, basic and diluted (in dollars per share)	$ (7.13)	$ (5.59)	$ (3.01)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted (in shares)	5,783	5,638	5,474
Amortization of intangible assets	$ 2,537	$ 2,850	$ 3,080
Cost of Sales [Member]
Operating expenses
Allocated Share-based Compensation Expense	739	822	1,314
Amortization of intangible assets	938	971	1,027
Restructuring Costs	176		184
Selling and Marketing Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	957	827	1,281
Amortization of intangible assets	658	877	934
Restructuring Costs	827		348
Research and Development Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	1,398	1,996	4,989
Amortization of intangible assets	938	969	1,027
Restructuring Costs	115		44
General and Administrative Expense [Member]
Operating expenses
Allocated Share-based Compensation Expense	877	1,059	2,711
Amortization of intangible assets	3	33	92
Restructuring Costs	$ 158		$ 20

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2015	5,346
Balances at Dec. 31, 2015	$ 5	$ 275,636	$ (179,733)	$ (1,777)	$ 94,131
Issuance of common stock from exercise of vested stock options, vesting of restricted stock units and vesting of options and shares subject to repurchase (Note 10) (in shares)	87				38
Issuance of common stock from exercise of vested stock options, vesting of restricted stock units and vesting of options and shares subject to repurchase (Note 10)	$ 1	569			$ 570
Tax withholding related to vesting of restricted stock units		(362)			(362)
Issuance of common stock under employee stock purchase plan (in shares)	42
Issuance of common stock under employee stock purchase plan		548			548
Issuance of unrestricted common stock in connection with acquisition of SocialMoov S.A.S. (in shares)	66
Issuance of unrestricted common stock in connection with acquisition of SocialMoov S.A.S.
Stock-based compensation expense		10,295			10,295
Net loss			(16,480)		(16,480)
Foreign currency translation adjustments and other, net		6		(1,110)	(1,104)
Balances (in shares) at Dec. 31, 2016	5,541
Balances at Dec. 31, 2016	$ 6	286,692	(196,213)	(2,887)	87,598
Issuance of common stock from exercise of vested stock options, vesting of restricted stock units and vesting of options and shares subject to repurchase (Note 10) (in shares)	79
Issuance of common stock from exercise of vested stock options, vesting of restricted stock units and vesting of options and shares subject to repurchase (Note 10)		11			11
Tax withholding related to vesting of restricted stock units		(604)			$ (604)
Issuance of common stock under employee stock purchase plan (in shares)	43				43
Issuance of common stock under employee stock purchase plan		362			$ 362
Issuance of unrestricted common stock in connection with acquisition of SocialMoov S.A.S. (in shares)	66
Issuance of unrestricted common stock in connection with acquisition of SocialMoov S.A.S.
Stock-based compensation expense		4,704			4,704
Net loss			(31,491)		(31,491)
Foreign currency translation adjustments and other, net		(2)		2,205	2,203
Balances (in shares) at Dec. 31, 2017	5,729
Balances at Dec. 31, 2017	$ 6	291,163	(227,704)	(682)	62,783
Tax withholding related to vesting of restricted stock units		(327)			$ (327)
Issuance of common stock under employee stock purchase plan (in shares)	86				86
Issuance of common stock under employee stock purchase plan		305			$ 305
Stock-based compensation expense		3,971			3,971
Net loss			(41,244)		(41,244)
Foreign currency translation adjustments and other, net		4		(356)	(352)
Issuance of common stock from vesting of restricted stock units (Note 10) (in shares)	123
Issuance of common stock from vesting of restricted stock units (Note 10)
Balances (in shares) at Dec. 31, 2018	5,938
Balances at Dec. 31, 2018	$ 6	295,116	(264,713)	(1,038)	29,371
Impact of adoption of ASC 606 on January 1, 2018 (Note 3)			$ 4,235		$ 4,235

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net loss	$ (41,244)	$ (31,491)	$ (16,480)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Impairment of goodwill	14,740	2,797
Depreciation	2,658	4,758	6,035
Amortization of internally developed software	3,774	3,669	2,988
Amortization of Intangible Assets, Total	2,537	2,850	3,080
Amortization of deferred costs to obtain and fulfill contracts	2,045
Gain on disposal of property and equipment	(1)	(11)	(3)
Unrealized foreign currency (gains) losses	(118)	986	(419)
Non-cash interest expense related to debt agreements		15	27
Stock-based compensation related to equity awards and restricted stock	3,971	4,704	10,295
Provision for bad debts	48	1,507	2,328
Deferred income tax benefits	(398)	(358)	(305)
Payment of contingent consideration for prior acquisition			(93)
Changes in operating assets and liabilities
Accounts receivable	(668)	4,754	795
Prepaid expenses and other assets	(609)	(310)	200
Accounts payable	(97)	306	741
Accrued expenses and other liabilities	382	954	(3,108)
Net cash (used in) provided by operating activities	(12,980)	(4,870)	6,081
Investing activities
Purchases of property and equipment	(586)	(461)	(1,207)
Proceeds from disposal of property and equipment	8	11	5
Capitalization of internally developed software	(2,129)	(2,068)	(4,712)
Net cash used in investing activities	(2,707)	(2,518)	(5,914)
Financing activities
Repayments of capital lease obligations and other debt agreements	(1,304)	(1,160)	(1,436)
Employee taxes paid for withheld shares upon equity award settlement	(265)	(604)	(362)
Proceeds from exercises of common stock options	0	0	390
Proceeds from employee stock purchase plan, net	282	312	663
Net cash used in financing activities	(1,287)	(1,452)	(745)
Effect of foreign exchange rate changes on cash and cash equivalents and restricted cash	(360)	1,964	(1,035)
Net decrease in cash and cash equivalents and restricted cash	(17,334)	(6,876)	(1,613)
Cash and cash equivalents and restricted cash
Beginning of year	28,837	35,713	37,326
End of year	11,503	28,837	35,713
Supplemental disclosures of other cash flow information
Cash paid for interest	153	210	189
Cash paid for income taxes	730	1,491	728
Supplemental disclosure of non-cash investing and financing activities
Issuance of common stock under employee stock purchase plan	305	362	548
Purchases of property and equipment recorded in accounts payable and accrued expenses	10	30	5
Acquisition of equipment through capital leases		$ 852	$ 1,864

Note 1 - Background

Note 1 - Background	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Nature of Operations [Text Block]	1. Marin Software Incorporated (the “Company”) was incorporated in Delaware in March 2006. References to “2018,” “2017” “2016” December 31, 2018, December 31, 2017 December 31, 2016,

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Significant Accounting Policies [Text Block]	2. Liquidity The Company has incurred significant losses in each fiscal year since its incorporation in 2006 $41,244, $31,491 $16,480 2018, 2017 2016, December 31, 2018, $264,713. $11,503 December 31, 2018. January 2018, 4 2018 2019. 12 Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation. Reclassifications When necessary, reclassifications have been made to prior period financial information to conform to the current year presentation. These reclassifications had no Reverse Stock Split and Reduction in Authorized Shares On October 5, 2017, seven one 500,000 142,857 Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make certain estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company is subject to uncertainties such as the impact of future events, economic and political factors and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations and if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowances for doubtful accounts and customer revenue credits, the carrying value of long-lived assets (including goodwill and intangible assets), the useful lives of long-lived assets, the accounting for income taxes and stock-based compensation. Certain Significant Risks and Uncertainties The Company operates in a rapidly changing environment that involves a number of risks, some of which are beyond the Company’s control that could have a material adverse effect on the Company’s business, operating results and financial condition. These risks include, among others, the Company’s history of losses and negative cash flows; the highly competitive environment in which the Company operates; the ability to maintain and increase usage rates of the Company’s platform and the ability for the Company to increase demand for its solutions. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents and accounts receivable. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company has not not As of December 31, 2018, one 3 30% December 31, 2017, no 10% No 10% December 31, 2018, 2017 2016. Cash and Cash Equivalents and Restricted Cash The Company considers all highly liquid investments with an original or remaining maturity from the Company’s date of purchase of 90 three $2,806 $8,831 December 31, 2018 2017, Restricted cash consists of deposits held with a financial institution to secure the Company’s non-cancelable lease for its corporate headquarters in San Francisco (see Note 8 Fair Value of Financial Instruments The Company’s financial instruments, including accounts receivable, accounts payable and accrued expenses are carried at cost, which approximates fair value because of the short-term nature of those instruments. Based on borrowing rates available to the Company for loans with similar terms and maturities, and in consideration of the Company’s credit risk profile, the carrying value of outstanding capital lease obligations (Note 8 2 The Company measures and reports certain financial assets at fair value on a recurring basis, including its investments in money market funds. The fair value hierarchy prioritizes the inputs into three Level 1 Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 Inputs are unobservable inputs based on the Company’s assumptions. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Allowances for Doubtful Accounts and Revenue Credits The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The Company performs a regular review of its customers’ payment histories and associated credit risks and it does not not 2018, 2017 2016, Years Ended December 31, 2018 2017 2016 Balances at beginning of year $ 4,028 $ 3,510 $ 2,188 Additions to expense 48 1,507 2,328 Write-offs and other deductions (1,425 ) (989 ) (1,006 ) Balances at end of year $ 2,651 $ 4,028 $ 3,510 From time to time, the Company provides revenue credits to customers. These typically relate to customer disputes and billing adjustments and are recorded as a reduction of revenues, net. Reserves for these revenues credits are accounted for as variable consideration under authoritative revenue recognition guidance (see Note 3 December 31, 2018 2017, $353 $799, Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations. Major additions and improvements are capitalized while repairs and maintenance that do not Internally Developed Software Costs incurred in the development phase are capitalized and amortized over the product’s estimated useful life, which is three 2018, 2017 2016, $2,129, $2,068, $4,712 $3,774, $3,669, $2,988 2018, 2017 2016, December 31, 2018 2017, $6,972 $8,617, Goodwill, Intangible Assets and Impairment Assessments Goodwill represents the excess of the purchase price in a business combination over the fair value of net tangible and intangible assets acquired. Intangible assets that are not two six The Company evaluates goodwill for impairment in the fourth may one not Due to a sustained decline in the market capitalization of the Company's common stock during the nine September 30, 2018, $14,740, nine September 30, 2018. first 2017 $2,797 December 31, 2017. 6 In the fourth 2018, no September 30, 2018, fourth 2018. Impairment of Long-Lived Assets The Company evaluates long-lived assets, excluding goodwill, for potential impairment whenever adverse events or changes in circumstances or business climate indicate that expected undiscounted future cash flows related to such long-lived assets may not not not no 2018, 2017 2016. Operating Leases The Company’s operating lease agreements include provisions for tenant improvement allowances, certain rent holidays and escalations in the base price of the rent payment. The Company defers tenant improvement allowances and amortizes the balance as a reduction to rent expense over the lease term. The Company records rent holidays and rent escalations on a straight-line basis over the lease term. Deferred rent is included in accrued expenses and other current liabilities, as well as other long-term liabilities in the accompanying consolidated balance sheets. Revenue Recognition The Company generates revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, social, eCommerce and display advertising. The Company also generates revenues from strategic agreements with certain leading publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that customers manage on its platform. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. See Note 3 Cost of Revenues Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based platform, providing implementation and ongoing customer support, data communications expenses, salaries and benefits of operations and support personnel, software license fees, costs associated with website development activities, indirect overhead, amortization expense associated with capitalized internally developed software and intangible assets and property and equipment depreciation. Stock-Based Compensation Expense Stock-based compensation expense is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. RSUs are measured based on the fair market values of the underlying common stock on the dates of grant. Shares of common stock are issued on the vesting dates. Fair values of stock option awards are determined on the date of grant using the Black-Scholes option-pricing model. In applying this option-pricing model, the Company’s determination of the fair value of the stock option award on the date of grant is affected by the Company’s fair value of its common stock, as well as assumptions regarding a number of subjective variables. These variables include, but are not For stock option and RSU awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. See Note 10 11 Research and Development Research and development costs are expensed as incurred, except for certain internal software development costs, which may third Advertising and Promotion Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of comprehensive loss. Advertising and promotion expense totaled $494, $758, $876 2018, 2017 2016, Sales Taxes Sales and other taxes collected from customers and remitted to governmental authorities are presented on a net basis and thus excluded from revenues. Foreign Currency For international subsidiaries whose functional currency is not The Company records net gains and losses resulting from foreign exchange transactions as a component of other income (expenses), net. Aggregate foreign currency gains (losses) included in determining net loss were $205, 1,029 3 2018, 2017 2016, Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between the financial statement and tax basis of assets and liabilities and net operating loss and credit carryforwards using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertain tax positions using a more-likely-than- not not 2018, 2017 2016. not twelve See Note 12 December 2017. Recently Accounting Pronouncements Adopted In May 2014, 2014 09, Revenue from Contracts with Customers 606 606 606” 606 606 January 1, 2018 606 3 606. In May 2017, 2017 09, Compensation – Stock Compensation 718 2017 09 January 1, 2018, no December 31, 2018. Recent Accounting Pronouncements Not In February 2016, 2016 02, Leases 842 840 2016 02 December 15, 2018, July 2018, 2018 10, Codification Improvements to Topic 842, 2018 11, Leases (Topic 842 2016 02 2018 11 January 1, 2019. 15, $15,500 $16,500, $17,500 $18,500. In February 2018, 2018 02, Income Statement – Reporting Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income 220 12 2018 02 December 15, 2018, not In August 2018, 2018 13, Fair Value Measurement 820 2018 13 December 15, 2019, In August 2018, 2018 15, Intangibles – Goodwill and Other – Internal-Use Software 35 40 2018 15 December 15, 2019,

Note 3 - Revenues

Note 3 - Revenues	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. Adoption of ASC 606 On January 1, 2018, 606 January 1, 2018 606, not The Company recorded a net reduction to opening accumulated deficit of $4,235, January 1, 2018 606, 1 2 606 606 Revenue Recognition The Company generates its revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, social, eCommerce and display advertising. It also generates a portion of its revenues from long-term strategic agreements with certain leading publishers. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. The Company determines revenue recognition through the following steps: ● Identification of the contract, or contracts, with a customer; ● Identification of the performance obligations in the contract; ● Determination of the transaction price; ● Allocation of the transaction price to the performance obligations in the contract; and ● Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscriptions The Company's subscription contracts provide advertisers with access to the Company's advertising management platform. Advertisers do not one not three six The Company's subscription services comprise a single stand-ready performance obligation satisfied over time as the advertiser simultaneously receives and consumes the benefit from the Company's performance. This performance obligation constitutes a series of services that are substantially the same and provided over time using the same measure of progress. Revenues derived from these arrangements are recognized over time using an output method based upon the passage of time as this provides a faithful depiction of the pattern of transfer of control. Fixed minimum monthly platform fees are recognized ratably over the contract term as the single performance obligation is satisfied. Variable fees are allocated to the distinct month of the series in which they are earned because the terms of the variable payments relate specifically to the outcome from transferring the distinct time increment (month) of service and because such amounts reflect the fees to which the Company expects to be entitled for providing access to the advertising management platform for that period, consistent with the allocation objective of ASC 606. Strategic Agreements The Company has entered into long-term strategic agreements with certain leading search publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that its customers manage on its platform. These strategic agreements are generally billed on a quarterly basis. The majority of the Company's strategic agreement revenue is concentrated to one December 2018, October 1, 2018. two three two no not two one The Company evaluates the total amount of variable revenue share payments expected to be earned from this agreement by using the expected value method, as it believes this method represents the most appropriate estimate for this consideration, based on historical service trends, the individual contract considerations and the Company's best judgment at the time. The Company includes estimates of variable consideration in revenues only to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not December 31, 2018, $2,933 one December 31, 2018, $11,709 $8,781 December 31, 2019 2020, Disaggregation of Revenues Revenues by geographic area, based on the billing location of the customer, were as follows for the periods presented: Years Ended December 31, 2018 2017 (1) 2016 (1) United States of America $ 40,907 $ 49,637 $ 69,220 United Kingdom 7,664 9,556 11,083 Other (2) 10,060 15,798 19,575 Total revenues, net $ 58,631 $ 74,991 $ 99,878 ( 1 December 31, 2017 2016 not 606 ( 2 No 10% Revenues by nature of services performed were as follows for the periods presented: Years Ended December 31, 2018 2017 (1) 2016 (1) Subscriptions $ 54,532 $ 73,453 $ 97,486 Strategic agreements 4,099 1,538 2,392 Total revenues, net $ 58,631 $ 74,991 $ 99,878 ( 1 December 31, 2017 2016 not 606 Contract Balances Accounts receivable, net The timing of revenue recognition may December 31, 2018 2017 December 31, 2018 $3,867 December 2018. Customer advances The Company records advances from customers for cash payments that are received in advance of its performance of the underlying services. These services are contracted on a weekly basis and cash payments are generally received on a weekly basis at amounts that are at the discretion of the customers, based on established advertising budgets. The unused portion of these advances from customers is included within accruals and other current liabilities on the accompanying consolidated balance sheets. Under the Company's terms of service, individual customer advances that are not 180 no January 1, 2018 $1,445 $558 January 1, 2018. December 31, 2018, $432 December 31, 2018. $213 December 31, 2018. Deferred Strategic Agreement Revenues Due to the timing of revenue recognition on the Company's long-term strategic agreement with Google, the contractual billings exceed revenue recognized to date, resulting in a contract liability. As of December 31, 2018, $934 Costs to Obtain and Fulfill Contracts The Company capitalizes certain contract acquisition costs, consisting primarily of commissions paid and the related payroll taxes that are incremental to obtaining customer contracts, when customer contracts are signed ("deferred costs to obtain contracts"). The Company also capitalizes certain contract fulfillment costs, consisting primarily of on-boarding and integration services for new and existing customers performed by the Company’s professional services team. The professional services payroll and the related fringe benefits that are directly related to fulfilling customer contracts are capitalized ("deferred costs to fulfill contracts"). The deferred costs to obtain and fulfill contracts are amortized based on the expected period of benefit, which the Company determined to be three The Company classifies deferred costs to obtain and fulfill contracts as current or non-current based on the timing of when the related amortization expense is expected be recognized. The current portion of these deferred costs is included in prepaid expenses and other current assets, while the non-current portion is included in other non-current assets on the accompanying consolidated balance sheets. Changes in the balances of deferred costs to obtain and fulfill contracts during the year ended December 31, 2018 Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at January 1, 2018, as adjusted for adoption of ASC 606 $ 1,760 $ 880 Costs deferred 1,094 330 Amortization (1,441 ) (604 ) Balances at December 31, 2018 $ 1,413 $ 606 ASC 606 The following table reflects the accounts impacted by the adoption of ASC 606 December 31, 2018: December 31, 2018 As Reported Balances Without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Prepaid expenses and other current assets $ 4,642 $ 3,482 $ 1,160 Other non-current assets 2,045 1,186 859 Liabilities Accrued expenses and other current liabilities $ 9,383 $ 12,125 $ (2,742 ) Stockholders' equity Accumulated deficit $ (264,713 ) $ (267,456 ) $ 2,743 The following tables reflects the impact of the adoption of ASC 606 December 31, 2018: Year Ended December 31, 2018 As Reported Balances Without Adoption of ASC 606 Effect of Change Higher/(Lower) Revenues, net $ 58,631 $ 59,352 $ (721 ) Cost of revenues 27,154 26,880 274 Gross profit 31,477 32,472 (995 ) Operating expenses Sales and marketing 23,425 23,078 347 Research and development 22,450 22,450 — General and administrative 13,113 13,113 — Impairment of goodwill 14,740 14,740 — Total operating expenses 73,728 73,381 347 Loss from operations (42,251 ) (40,909 ) (1,342 ) Other income, net 1,593 1,593 — Loss before provision for income taxes (40,658 ) (39,316 ) (1,342 ) Provision for income taxes (586 ) (586 ) — Net loss $ (41,244 ) $ (39,902 ) $ (1,342 ) Net loss per share available to common stockholders, basic and diluted $ (7.13 ) $ (6.90 ) $ (0.23 ) Practical Expedients and Exemptions The Company does not one

Note 4 - Restructuring Activiti

Note 4 - Restructuring Activities	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	4. 2018 On January 24, 2018, “2018 2018 13% 2018 December 31, 2018, not 2018 December 31, 2018, $1,276 2018 No December 31, 2018. 2016 During 2016, “2016 $596 2016 December 31, 2016. 2016 December 31, 2016, no December 31, 2018 2017.

Note 5 - Balance Sheet Componen

Note 5 - Balance Sheet Components	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	5. The following table shows the components of property and equipment as of the dates presented: December 31, Estimated Useful Life 2018 2017 Computer equipment 3 to 4 years $ 27,781 $ 29,938 Software, including internally developed software 3 years 25,518 23,389 Leasehold improvements Shorter of useful life or lease term 4,778 4,617 Office equipment, furniture and fixtures 3 to 5 years 2,140 2,127 Total property and equipment 60,217 60,071 Less: Accumulated depreciation and amortization (48,402 ) (44,512 ) Property and equipment, net $ 11,815 $ 15,559 Depreciation and amortization of internally developed software for 2018, 2017 2016 $6,432, $8,427, $9,023, The following table shows the components of accrued expenses and other current liabilities as of the dates presented: December 31, 2018 2017 Accrued salary and payroll-related expenses $ 3,695 $ 4,372 Deferred strategic agreement revenues (Note 3) 934 — Income taxes payable 883 142 Accrued liabilities 866 2,161 Advanced billings 859 459 Deferred rent 538 475 Customer advances (Note 3) 432 2,003 Sales and use tax payable 244 341 Other 932 521 Total accrued expenses and other current liabilities $ 9,383 $ 10,474

Note 6 - Goodwill and Intangibl

Note 6 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	6. The goodwill balance as of December 31, 2018 $1,943 nine September 30, 2018, For the purposes of the goodwill impairment test performed on September 30, 2018, September 30, 2018, 2 7 $14,740, December 31, 2018, third Similarly, there was a sustained decline in the Company's stock price in the six June 30, 2017, June 30, 2017, 2 $2,797, December 31, 2017, second No three December 31, 2018, fourth The goodwill activity for the year ended December 31, 2018 Balance at December 31, 2017 $ 16,768 Impairment (14,740 ) Foreign currency translation adjustments (85 ) Balance at December 31, 2018 $ 1,943 Intangible assets consisted of the following as of the dates presented: December 31, Estimated Useful Life 2018 2017 Developed technology 5 to 6 years $ 9,910 $ 9,910 Customer relationships 4 years 2,080 3,370 Tradename 3 years — 1,390 Total intangible assets 11,990 14,670 Less: accumulated amortization (10,052 ) (10,195 ) Intangible assets, net $ 1,938 $ 4,475 Amortization expense for 2018, 2017 2016 $2,537, $2,850, $3,080. Future estimated amortization of intangible assets as of December 31, 2018 Year ending December 31, 2019 $ 1,843 Year ending December 31, 2020 95 Total $ 1,938

Note 7 - Fair Value Measurement

Note 7 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	7. Account balances measured at fair value on a recurring basis include the following as of the dates presented: December 31, 2018 2017 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents Money market funds $ 2,806 $ — $ — $ 8,831 $ — $ — The Company’s cash equivalents as of December 31, 2018 2017 1. no December 31, 2018 2017.

Note 8 - Capital Lease Obligati

Note 8 - Capital Lease Obligations	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Debt and Capital Leases Disclosures [Text Block]	8. At various dates between August 2015 September 2017, nine 5.7% 7.9% 36 48 In September October 2016, two 5.2% 48 As of December 31, 2018 2017, $2,003 $2,861, $1,798 $3,103, Future minimum capital lease payments as of December 31, 2018 Year Ending December 31, 2019 $ 1,324 December 31, 2020 552 December 31, 2021 11 Total 1,887 Less: Amount representing interest (89 ) Present value of capital lease obligations 1,798 Less: Current portion of capital lease obligations (1,249 ) Non-current portion of capital lease obligations $ 549 In connection with its non-cancelable lease for its corporate headquarters in San Francisco, the Company maintains a standby letter of credit agreement for $1,293 with Silicon Valley Bank. The Company is required to separately restrict from use $1,293 in cash held at Silicon Valley Bank to secure this letter of credit. This balance has been classified as restricted cash on the consolidated balance sheets.

Note 9 - Common Stock

Note 9 - Common Stock	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	9. As of December 31, 2018 2017, 142,857 $0.001 10,000 $0.001 December 31, 2018 2017 Options or RSUs available for future grant under stock option plans 896 999 Options outstanding under stock option plans 436 436 RSUs outstanding under stock option plans 834 568 Shares available for future issuance under employee stock purchase plan 153 182 Total 2,319 2,185

Note 10 - Equity Award Plans

Note 10 - Equity Award Plans	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	10. In April 2006, 2006 “2006 February 2013, 2013 “2013 March 21, 2013. 2006 2013 643 2006 2013 2013 January 1 first 10 2023, 2013 5% December 31, 2013 297 January 1, 2019. Stock Options Under the 2006 2013 may not ten may three may 12 no may A summary of stock option activity under the 2006 2013 Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Balance at December 31, 2015 851 $ 53.06 7.85 $ 957 Options granted 172 18.62 6.82 Options exercised (38 ) 10.36 — Options forfeited and cancelled (449 ) 54.53 — Balance at December 31, 2016 536 $ 43.83 7.48 $ 194 Options granted 79 11.66 9.35 Options forfeited and cancelled (179 ) 44.82 — Balance at December 31, 2017 436 $ 37.60 7.04 $ 65 Options granted 122 7.06 7.93 Options forfeited and cancelled (122 ) 37.55 — Balance at December 31, 2018 436 $ 29.01 6.79 $ — Options exercisable as of December 31, 2018 289 38.65 5.76 — Options vested as of December 31, 2018 289 38.64 5.76 — Options vested and expected to vest as of December 31, 2018 423 29.58 6.73 — The intrinsic value of options exercised during 2016 $328. 2018, 2017 2016 $778, $1,451, $5,424, RSUs A summary of RSU activity under the 2013 RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2015 175 $ 65.52 RSUs granted 446 18.76 RSUs vested (30 ) 50.33 RSUs cancelled (162 ) 30.80 Granted and unvested at December 31, 2016 429 $ 21.48 RSUs granted 405 10.56 RSUs vested (78 ) 21.29 RSUs cancelled and withheld to cover taxes (188 ) 19.97 Granted and unvested at December 31, 2017 568 $ 14.22 RSUs granted 709 6.34 RSUs vested (123 ) 14.87 RSUs cancelled and withheld to cover taxes (320 ) 12.75 Granted and unvested at December 31, 2018 834 $ 7.99 Employee Stock Purchase Plan In February 2013, 2013 “2013 143 2013 March 22, 2013. 2013 six 2013 85% 1 first 2 January 1 first 10 first 2013 1% December 31, not 100 2013 59 January 1, 2019. 2018 2017, 86 43 2013

Note 11 - Stock-based Compensat

Note 11 - Stock-based Compensation Expense	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	11. The Company recorded stock-based compensation expense of $3,971, $4,704 $10,295 2018, 2017 2016, Stock Options The Company uses the Black-Scholes option-pricing model to estimate the fair value of options. This model requires the input of highly subjective assumptions including the expected volatility, risk-free interest rate and the expected life of options. The Company used the following assumptions for its Black-Scholes option-pricing model for the periods presented: Years Ended December 31, 2018 2017 2016 Dividend yield — — — Expected volatility 55.9 % 47.3 % 47.5 % Risk-free interest rate 2.54 % 2.03 % 1.38 % Expected life of options (in years) 4.00 6.25 6.25 Weighted-average grant-date fair value $ 3.20 $ 5.61 $ 8.82 Weighted-average grant-date exercise price $ 7.06 $ 11.66 $ 18.62 Starting in 2018, March 2013. 2018, no The Company recognized stock-based compensation expense only for those shares expected to vest over the requisite service period of the underlying award. The company determines its estimated forfeiture rated based on an analysis of its actual forfeitures and will continue to evaluate the appropriateness of the forfeiture rate based on recent forfeiture activity and expected future employee turnover, if any. Changes in the estimated forfeiture rate can have a significant effect on reported stock-based compensation expense, as the cumulative effect of adjusting the rate for all expense is recognized in the period the forfeiture estimate is changed. No not not, not There were no 2018 2017. $390 2016. December 31, 2018 2017, $518 $934, 1.8 1.6 RSUs As of December 31, 2018 2017, $4,852 $6,428, 2.5 2.1 Employee Stock Purchase Plan The Company estimates the fair value of purchase rights under the 2013 2013 six 2013

Note 12 - Income Taxes

Note 12 - Income Taxes	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. The components of the Company’s loss before provision for income taxes were as follows: Years Ended December 31, 2018 2017 2016 United States of America $ (25,375 ) $ (15,740 ) $ (7,595 ) International (15,283 ) (14,744 ) (7,481 ) Loss before provision for income taxes $ (40,658 ) $ (30,484 ) $ (15,076 ) The components of the provision for income taxes were as follows: Years Ended December 31, 2018 2017 2016 Current income tax provision Federal $ — $ — $ — State 44 64 58 Foreign 940 1,301 1,708 Total current income tax provision 984 1,365 1,766 Deferred income tax benefit Federal — — — State — — — Foreign (398 ) (358 ) (362 ) Total deferred income tax benefit (398 ) (358 ) (362 ) Provision for income taxes $ 586 $ 1,007 $ 1,404 The differences in the total provision for income taxes that would result from applying the 21% 2018, 34% 2017 2016, Years Ended December 31, 2018 2017 2016 Tax benefit at U.S. statutory rate $ (8,538 ) $ (10,365 ) $ (5,126 ) Foreign income and withholding taxes 4,247 5,578 4,317 Other permanent differences 3,807 974 — State income taxes, net of federal benefit (1,766 ) (2,858 ) (147 ) Change in valuation allowance 1,402 (8,158 ) 155 Stock-based compensation 847 1,085 2,231 Research and development credits (822 ) (382 ) (736 ) Provision to return adjustments 658 153 (484 ) Uncertain tax positions 224 1,995 1,146 Impact of change to U.S. statutory rate from Tax Cuts and Jobs Act — 14,302 — Recognition of tax windfalls related to stock-based compensation — (1,291 ) — Other 527 (26 ) 48 Provision for income taxes $ 586 $ 1,007 $ 1,404 Major components of the Company’s deferred tax assets (liabilities) as of December 31, 2018 2017 December 31, 2018 2017 Net operating loss $ 27,192 $ 25,002 Research and development credits 9,308 8,757 Stock-based compensation 2,519 2,796 Accruals and reserves 513 1,656 Property and equipment and intangible assets (342 ) (710 ) Other 3,272 3,161 Net deferred tax assets 42,462 40,662 Valuation allowance (42,626 ) (41,224 ) Total non-current net deferred tax liabilities, net of valuation allowance $ (164 ) $ (562 ) The Tax Reform Act of 1986, may may 382 382” may 382. may may one not 50% three 382 fourth 2017 no may As of December 31, 2018, $117,816 $98,993, 2026 2022. December 31, 2018, $6,328 $7,084, 2026. not The Company has recorded a full valuation allowance against its otherwise recognizable deferred income tax assets as of December 31, 2018 2017 not not $1,402 December 31, 2018, $8,158 December 31, 2017 $469 December 31, 2016. The Company files federal, state and foreign income tax returns in jurisdictions with varying statutes of limitations. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world. These audits include questioning the timing and amount of deduction, the nexus of income among various tax jurisdictions and compliance with state, local and foreign tax laws. The Company is not 2006 Uncertain Tax Positions As of December 31, 2018 2017, $1,203 $1,610, 2018, 2017 2016, not Ending balance as of December 31, 2015 $ 7,558 Decrease in balances related to tax positions taken during the current period (2 ) Increase in balances related to tax positions taken during the prior period 1,240 Ending balance as of December 31, 2016 8,796 Increase in balances related to tax positions taken during the current period 1,738 Decrease in balances related to tax positions taken during the prior period (9 ) Decrease in balances due to change in United States statutory rate (2,101 ) Ending balance as of December 31, 2017 8,424 Increase in balances related to tax positions taken during the current period 778 Decrease in balances related to tax positions taken during the prior period (812 ) Ending balance as of December 31, 2018 $ 8,390 The Company does not December 31, 2018 twelve The Tax Cuts and Jobs Act On December 22, 2017, not 1 35% 21% December 31, 2017; ( 2 3 one not $18,696 $4,394, $14,302 December 31, 2017. The SEC staff issued Staff Accounting Bulletin No. 118 118" not 118 not one December 31, 2018. 118, not December 31, 2018. The BEAT provisions in the TCJA essentially represent a 10% 5% December 31, 2017, 10% December 31, 2018) not three $500,000. not December 31, 2018. In addition, the TCJA imposes a U.S. tax on GILTI that is earned by certain foreign subsidiaries, and requires U.S. corporations to elect an accounting policy to either recognize GILTI as a current period expense when incurred or to record deferred taxes for the temporary basis differences expected to reverse in the future as GILTI. The Company did not December 31, 2018, The Transition Tax is imposed on previously untaxed historical earnings and profits of foreign subsidiaries. Based on an evaluation of the Company’s operations, no December 31, 2017

Note 13 - Net Loss Per Share Av

Note 13 - Net Loss Per Share Available to Common Stockholders	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	13. Basic net loss of common stock is calculated by dividing the net loss available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average number of shares of common stock excludes those shares subject to repurchase related to stock options or restricted stock that were exercised or issued, respectively, prior to vesting, as those shares are not The following table presents the calculation of basic and diluted net loss per share: Years Ended December 31, 2018 2017 2016 Numerator: Net loss available to common stockholders $ (41,244 ) $ (31,491 ) $ (16,480 ) Denominator: Weighted average number of shares, basic and diluted 5,783 5,638 5,474 Net loss per share available to common stockholders: Basic and diluted net loss per common share available to common stockholders $ (7.13 ) $ (5.59 ) $ (3.01 ) The following table presents the potential common shares outstanding that were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been anti-dilutive: Years Ended December 31, 2018 2017 2016 Options to purchase common stock 436 436 536 RSUs 834 568 429 Common stock subject to repurchase — — 1 Total 1,270 1,004 966

Note 14 - Segment Reporting

Note 14 - Segment Reporting	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14. The Company defines the term “chief operating decision maker” to be the Chief Executive Officer. The Chief Executive Officer reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. Accordingly, the Company has determined that it operates as a single reportable and operating segment. See Note 3 December 31, 2018 2017 United States of America $ 11,483 $ 15,069 International 332 490 Total long-lived assets, net $ 11,815 $ 15,559

Note 15 - Commitments and Conti

Note 15 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	15. Operating Leases Rent expense for 2018, 2017 20156 $8,420, $8,519, $8,760, The Company has leased office space in San Francisco, Austin, Chicago, Dublin, London, New York, Paris, Portland, Shanghai and Tokyo under non-cancelable operating leases, which expire between 2019 2024. The Company also maintains sublease agreements with for portions of its San Francisco and Portland office spaces. In August 2018, July 2022, 14,380 third July 2020, July 2022. third May 2020. December 31, 2018, 2017 2016 $1,463, $1,096 $753, Future minimum lease payments for significant non-cancelable operating leases and the related sublease income as of December 31, 2018 Year Ending Operating Lease Expense Operating Sublease Income December 31, 2019 $ 8,239 $ 2,249 December 31, 2020 3,691 1,768 December 31, 2021 3,427 1,105 December 31, 2022 2,194 616 December 31, 2023 362 — Thereafter 90 — Total $ 18,003 $ 5,738 Legal Matters From time to time, the Company may Indemnification The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the agreements, each party may third third not no December 31, 2018 2017. The Company also indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company’s request in such capacity. The maximum amount of potential future indemnification is unlimited; however, the Company has a Directors and Officers insurance policy that limits its exposure and enables the Company to recover a portion of any future amounts paid. Historically, the Company has not no December 31, 2018 2017. Other Contingencies The Company is subject to claims and assessments from time to time in the ordinary course of business. The Company’s management does not

Note 16 - Employee Benefit Plan

Note 16 - Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	16. The Company sponsors a 401 no 2018, 2017 2016. The Company also sponsors a statutorily required defined contribution pension plan covering all employees in the United Kingdom. The Company made contributions to this plan of $87, $75 $85 December 31, 2018, 2017 2016,

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Liquidity Policy [Policy Text Block]	Liquidity The Company has incurred significant losses in each fiscal year since its incorporation in 2006 $41,244, $31,491 $16,480 2018, 2017 2016, December 31, 2018, $264,713. $11,503 December 31, 2018. January 2018, 4 2018 2019. 12
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.
Reclassification, Policy [Policy Text Block]	Reclassifications When necessary, reclassifications have been made to prior period financial information to conform to the current year presentation.
Stockholders' Equity, Policy [Policy Text Block]	Reverse Stock Split and Reduction in Authorized Shares On October 5, 2017, seven one 500,000 142,857
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make certain estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company is subject to uncertainties such as the impact of future events, economic and political factors and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations and if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowances for doubtful accounts and customer revenue credits, the carrying value of long-lived assets (including goodwill and intangible assets), the useful lives of long-lived assets, the accounting for income taxes and stock-based compensation.
Significant Risks and Uncertainties, Policy [Policy Text Block]	Certain Significant Risks and Uncertainties The Company operates in a rapidly changing environment that involves a number of risks, some of which are beyond the Company’s control that could have a material adverse effect on the Company’s business, operating results and financial condition. These risks include, among others, the Company’s history of losses and negative cash flows; the highly competitive environment in which the Company operates; the ability to maintain and increase usage rate of the Company’s platform and the ability for the Company to increase demand for its solutions.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents and accounts receivable. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company has not not As of December 31, 2018, one 3 30% December 31, 2017, no 10% No 10% December 31, 2018, 2017 2016.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents and Restricted Cash The Company considers all highly liquid investments with an original or remaining maturity from the Company’s date of purchase of 90 three $2,806 $8,831 December 31, 2018 2017, Restricted cash consists of deposits held with a financial institution to secure the Company’s non-cancelable lease for its corporate headquarters in San Francisco (see Note 8
Fair Value Measurement, Policy [Policy Text Block]	Fair Value of Financial Instruments The Company’s financial instruments, including accounts receivable, accounts payable and accrued expenses are carried at cost, which approximates fair value because of the short-term nature of those instruments. Based on borrowing rates available to the Company for loans with similar terms and maturities, and in consideration of the Company’s credit risk profile, the carrying value of outstanding capital lease obligations (Note 8 2 The Company measures and reports certain financial assets at fair value on a recurring basis, including its investments in money market funds. The fair value hierarchy prioritizes the inputs into three Level 1 Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 Inputs are unobservable inputs based on the Company’s assumptions. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]	Allowances for Doubtful Accounts and Revenue Credits The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The Company performs a regular review of its customers’ payment histories and associated credit risks and it does not not 2017, 2016 2015, Years Ended December 31, 2018 2017 2016 Balances at beginning of year $ 4,028 $ 3,510 $ 2,188 Additions to expense 48 1,507 2,328 Write-offs and other deductions (1,425 ) (989 ) (1,006 ) Balances at end of year $ 2,651 $ 4,028 $ 3,510 From time to time, the Company provides revenue credits to customers and an allowance is made based on historical credit activity. These credits typically relate to customer disputes and billing adjustments and are estimated at the time revenue is recognized and recorded as a reduction of revenues, net. As of December 31, 2018 2017, $353 $799,
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations. Major additions and improvements are capitalized while repairs and maintenance that do not
Internal Use Software, Policy [Policy Text Block]	Internally Developed Software Costs incurred in the development phase are capitalized and amortized over the product’s estimated useful life, which is three 2018, 2017 2016, $2,129, $2,068, $4,712 $3,774, $3,669, $2,988 2018, 2017 2016, December 31, 2018 2017, $6,972 $8,617,
Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]	Goodwill, Intangible Assets and Impairment Assessments Goodwill represents the excess of the purchase price in a business combination over the fair value of net tangible and intangible assets acquired. Intangible assets that are not two six The Company evaluates goodwill for impairment in the fourth may one not Due to a sustained decline in the market capitalization of the Company's common stock during the nine September 30, 2018, $14,740, three September 30, 2018. first 2017 $2,797 December 31, 2017. 6 In the fourth 2018, no September 30, 2018, fourth
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets The Company evaluates long-lived assets, excluding goodwill, for potential impairment whenever adverse events or changes in circumstances or business climate indicate that expected undiscounted future cash flows related to such long-lived assets may not not not no 2018, 2017 2016.
Revenue Recognition Leases, Operating [Policy Text Block]	Operating Leases The Company’s operating lease agreements include provisions for tenant improvement allowances, certain rent holidays and escalations in the base price of the rent payment. The Company defers tenant improvement allowances and amortizes the balance as a reduction to rent expense over the lease term. The Company records rent holidays and rent escalations on a straight-line basis over the lease term. Deferred rent is included in accrued expenses and other current liabilities, as well as other long-term liabilities in the accompanying consolidated balance sheets.
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition The Company generates revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, social, eCommerce and display advertising. The Company also generates revenues from strategic agreements with certain leading publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that customers manage on its platform. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. See Note 3
Cost of Sales, Policy [Policy Text Block]	Cost of Revenues Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based platform, providing implementation and ongoing customer support, data communications expenses, salaries and benefits of operations and support personnel, software license fees, costs associated with website development activities, indirect overhead, amortization expense associated with capitalized internally developed software and intangible assets and property and equipment depreciation.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-Based Compensation Expense Stock-based compensation expense is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. RSUs are measured based on the fair market values of the underlying common stock on the dates of grant. Shares of common stock are issued on the vesting dates. Fair values of stock option awards are determined on the date of grant using the Black-Scholes option-pricing model. In applying this option-pricing model, the Company’s determination of the fair value of the stock option award on the date of grant is affected by the Company’s fair value of its common stock, as well as assumptions regarding a number of subjective variables. These variables include, but are not For stock option and RSU awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. See Note 10 11
Research and Development Expense, Policy [Policy Text Block]	Research and Development Research and development costs are expensed as incurred, except for certain internal software development costs, which may
Advertising Costs, Policy [Policy Text Block]	Advertising and Promotion Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of comprehensive loss. Advertising and promotion expense totaled $494, $758, $876 2018, 2017 2016,
Sales Taxes [Policy Text Block]	Sales Taxes Sales and other taxes collected from customers and remitted to governmental authorities are presented on a net basis and thus excluded from revenues.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency For international subsidiaries whose functional currency is not The Company records net gains and losses resulting from foreign exchange transactions as a component of other income (expenses), net. Aggregate foreign currency gains (losses) included in determining net loss were $205, 1,029 3 2018, 2017 2016,
Income Tax, Policy [Policy Text Block]	Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between the financial statement and tax basis of assets and liabilities and net operating loss and credit carryforwards using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertain tax positions using a more-likely-than- not no 2018, 2017 2016. not twelve See Note 12 December 2017.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Accounting Pronouncements Adopted In May 2014, 2014 09, Revenue from Contracts with Customers 606 606 606” 606 606 January 1, 2018 3 606. In May 2017, 2017 09, Compensation – Stock Compensation 718 2017 09 January 1, 2018, no December 31, 2018. Recent Accounting Pronouncements Not In February 2016, 2016 02, Leases 842 840 2016 02 December 15, 2018, July 2018, 2018 10, Codification Improvements to Topic 842, 2018 11, Leases (Topic 842 2016 02 2018 11 January 1, 2019. 15, $15,500 $16,500, $17,500 $18,500. In February 2018, 2018 02, Income Statement – Reporting Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income 220 12 2018 02 December 15, 2018, In August 2018, 2018 13, Fair Value Measurement 820 2018 13 December 15, 2019, In August 2018, 2018 15, Intangibles – Goodwill and Other – Internal-Use Software 35 40 2018 15 December 15, 2019,

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Allowance for Doubtful Accounts [Table Text Block]	Years Ended December 31, 2018 2017 2016 Balances at beginning of year $ 4,028 $ 3,510 $ 2,188 Additions to expense 48 1,507 2,328 Write-offs and other deductions (1,425 ) (989 ) (1,006 ) Balances at end of year $ 2,651 $ 4,028 $ 3,510

Note 3 - Revenues (Tables)

Note 3 - Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Disaggregation of Revenue [Table Text Block]	Years Ended December 31, 2018 2017 (1) 2016 (1) United States of America $ 40,907 $ 49,637 $ 69,220 United Kingdom 7,664 9,556 11,083 Other (2) 10,060 15,798 19,575 Total revenues, net $ 58,631 $ 74,991 $ 99,878 Years Ended December 31, 2018 2017 (1) 2016 (1) Subscriptions $ 54,532 $ 73,453 $ 97,486 Strategic agreements 4,099 1,538 2,392 Total revenues, net $ 58,631 $ 74,991 $ 99,878
Capitalized Contract Cost [Table Text Block]	Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at January 1, 2018, as adjusted for adoption of ASC 606 $ 1,760 $ 880 Costs deferred 1,094 330 Amortization (1,441 ) (604 ) Balances at December 31, 2018 $ 1,413 $ 606
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	December 31, 2018 As Reported Balances Without Adoption of ASC 606 Effect of Change Higher/(Lower) Assets Prepaid expenses and other current assets $ 4,642 $ 3,482 $ 1,160 Other non-current assets 2,045 1,186 859 Liabilities Accrued expenses and other current liabilities $ 9,383 $ 12,125 $ (2,742 ) Stockholders' equity Accumulated deficit $ (264,713 ) $ (267,456 ) $ 2,743 Year Ended December 31, 2018 As Reported Balances Without Adoption of ASC 606 Effect of Change Higher/(Lower) Revenues, net $ 58,631 $ 59,352 $ (721 ) Cost of revenues 27,154 26,880 274 Gross profit 31,477 32,472 (995 ) Operating expenses Sales and marketing 23,425 23,078 347 Research and development 22,450 22,450 — General and administrative 13,113 13,113 — Impairment of goodwill 14,740 14,740 — Total operating expenses 73,728 73,381 347 Loss from operations (42,251 ) (40,909 ) (1,342 ) Other income, net 1,593 1,593 — Loss before provision for income taxes (40,658 ) (39,316 ) (1,342 ) Provision for income taxes (586 ) (586 ) — Net loss $ (41,244 ) $ (39,902 ) $ (1,342 ) Net loss per share available to common stockholders, basic and diluted $ (7.13 ) $ (6.90 ) $ (0.23 )

Note 5 - Balance Sheet Compon_2

Note 5 - Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, Estimated Useful Life 2018 2017 Computer equipment 3 to 4 years $ 27,781 $ 29,938 Software, including internally developed software 3 years 25,518 23,389 Leasehold improvements Shorter of useful life or lease term 4,778 4,617 Office equipment, furniture and fixtures 3 to 5 years 2,140 2,127 Total property and equipment 60,217 60,071 Less: Accumulated depreciation and amortization (48,402 ) (44,512 ) Property and equipment, net $ 11,815 $ 15,559
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 2018 2017 Accrued salary and payroll-related expenses $ 3,695 $ 4,372 Deferred strategic agreement revenues (Note 3) 934 — Income taxes payable 883 142 Accrued liabilities 866 2,161 Advanced billings 859 459 Deferred rent 538 475 Customer advances (Note 3) 432 2,003 Sales and use tax payable 244 341 Other 932 521 Total accrued expenses and other current liabilities $ 9,383 $ 10,474

Note 6 - Goodwill and Intangi_2

Note 6 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Goodwill [Table Text Block]	Balance at December 31, 2017 $ 16,768 Impairment (14,740 ) Foreign currency translation adjustments (85 ) Balance at December 31, 2018 $ 1,943
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, Estimated Useful Life 2018 2017 Developed technology 5 to 6 years $ 9,910 $ 9,910 Customer relationships 4 years 2,080 3,370 Tradename 3 years — 1,390 Total intangible assets 11,990 14,670 Less: accumulated amortization (10,052 ) (10,195 ) Intangible assets, net $ 1,938 $ 4,475
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, 2019 $ 1,843 Year ending December 31, 2020 95 Total $ 1,938

Note 7 - Fair Value Measureme_2

Note 7 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	December 31, 2018 2017 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents Money market funds $ 2,806 $ — $ — $ 8,831 $ — $ —

Note 8 - Capital Lease Obliga_2

Note 8 - Capital Lease Obligations (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Maturities of Long-term Debt [Table Text Block]	Year Ending December 31, 2019 $ 1,324 December 31, 2020 552 December 31, 2021 11 Total 1,887 Less: Amount representing interest (89 ) Present value of capital lease obligations 1,798 Less: Current portion of capital lease obligations (1,249 ) Non-current portion of capital lease obligations $ 549 In connection with its non-cancelable lease for its corporate headquarters in San Francisco, the Company maintains a standby letter of credit agreement for $1,293 with Silicon Valley Bank. The Company is required to separately restrict from use $1,293 in cash held at Silicon Valley Bank to secure this letter of credit. This balance has been classified as restricted cash on the consolidated balance sheets.

Note 9 - Common Stock (Tables)

Note 9 - Common Stock (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Stockholders Equity [Table Text Block]	December 31, 2018 2017 Options or RSUs available for future grant under stock option plans 896 999 Options outstanding under stock option plans 436 436 RSUs outstanding under stock option plans 834 568 Shares available for future issuance under employee stock purchase plan 153 182 Total 2,319 2,185

Note 10 - Equity Award Plans (T

Note 10 - Equity Award Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Share-based Compensation, Stock Options, Activity [Table Text Block]	Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Balance at December 31, 2015 851 $ 53.06 7.85 $ 957 Options granted 172 18.62 6.82 Options exercised (38 ) 10.36 — Options forfeited and cancelled (449 ) 54.53 — Balance at December 31, 2016 536 $ 43.83 7.48 $ 194 Options granted 79 11.66 9.35 Options forfeited and cancelled (179 ) 44.82 — Balance at December 31, 2017 436 $ 37.60 7.04 $ 65 Options granted 122 7.06 7.93 Options forfeited and cancelled (122 ) 37.55 — Balance at December 31, 2018 436 $ 29.01 6.79 $ — Options exercisable as of December 31, 2018 289 38.65 5.76 — Options vested as of December 31, 2018 289 38.64 5.76 — Options vested and expected to vest as of December 31, 2018 423 29.58 6.73 —
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2015 175 $ 65.52 RSUs granted 446 18.76 RSUs vested (30 ) 50.33 RSUs cancelled (162 ) 30.80 Granted and unvested at December 31, 2016 429 $ 21.48 RSUs granted 405 10.56 RSUs vested (78 ) 21.29 RSUs cancelled and withheld to cover taxes (188 ) 19.97 Granted and unvested at December 31, 2017 568 $ 14.22 RSUs granted 709 6.34 RSUs vested (123 ) 14.87 RSUs cancelled and withheld to cover taxes (320 ) 12.75 Granted and unvested at December 31, 2018 834 $ 7.99

Note 11 - Stock-based Compens_2

Note 11 - Stock-based Compensation Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Years Ended December 31, 2018 2017 2016 Dividend yield — — — Expected volatility 55.9 % 47.3 % 47.5 % Risk-free interest rate 2.54 % 2.03 % 1.38 % Expected life of options (in years) 4.00 6.25 6.25 Weighted-average grant-date fair value $ 3.20 $ 5.61 $ 8.82 Weighted-average grant-date exercise price $ 7.06 $ 11.66 $ 18.62

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Years Ended December 31, 2018 2017 2016 United States of America $ (25,375 ) $ (15,740 ) $ (7,595 ) International (15,283 ) (14,744 ) (7,481 ) Loss before provision for income taxes $ (40,658 ) $ (30,484 ) $ (15,076 )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Years Ended December 31, 2018 2017 2016 Current income tax provision Federal $ — $ — $ — State 44 64 58 Foreign 940 1,301 1,708 Total current income tax provision 984 1,365 1,766 Deferred income tax benefit Federal — — — State — — — Foreign (398 ) (358 ) (362 ) Total deferred income tax benefit (398 ) (358 ) (362 ) Provision for income taxes $ 586 $ 1,007 $ 1,404
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Years Ended December 31, 2018 2017 2016 Tax benefit at U.S. statutory rate $ (8,538 ) $ (10,365 ) $ (5,126 ) Foreign income and withholding taxes 4,247 5,578 4,317 Other permanent differences 3,807 974 — State income taxes, net of federal benefit (1,766 ) (2,858 ) (147 ) Change in valuation allowance 1,402 (8,158 ) 155 Stock-based compensation 847 1,085 2,231 Research and development credits (822 ) (382 ) (736 ) Provision to return adjustments 658 153 (484 ) Uncertain tax positions 224 1,995 1,146 Impact of change to U.S. statutory rate from Tax Cuts and Jobs Act — 14,302 — Recognition of tax windfalls related to stock-based compensation — (1,291 ) — Other 527 (26 ) 48 Provision for income taxes $ 586 $ 1,007 $ 1,404
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2018 2017 Net operating loss $ 27,192 $ 25,002 Research and development credits 9,308 8,757 Stock-based compensation 2,519 2,796 Accruals and reserves 513 1,656 Property and equipment and intangible assets (342 ) (710 ) Other 3,272 3,161 Net deferred tax assets 42,462 40,662 Valuation allowance (42,626 ) (41,224 ) Total non-current net deferred tax liabilities, net of valuation allowance $ (164 ) $ (562 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Ending balance as of December 31, 2015 $ 7,558 Decrease in balances related to tax positions taken during the current period (2 ) Increase in balances related to tax positions taken during the prior period 1,240 Ending balance as of December 31, 2016 8,796 Increase in balances related to tax positions taken during the current period 1,738 Decrease in balances related to tax positions taken during the prior period (9 ) Decrease in balances due to change in United States statutory rate (2,101 ) Ending balance as of December 31, 2017 8,424 Increase in balances related to tax positions taken during the current period 778 Decrease in balances related to tax positions taken during the prior period (812 ) Ending balance as of December 31, 2018 $ 8,390

Note 13 - Net Loss Per Share _2

Note 13 - Net Loss Per Share Available to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Years Ended December 31, 2018 2017 2016 Numerator: Net loss available to common stockholders $ (41,244 ) $ (31,491 ) $ (16,480 ) Denominator: Weighted average number of shares, basic and diluted 5,783 5,638 5,474 Net loss per share available to common stockholders: Basic and diluted net loss per common share available to common stockholders $ (7.13 ) $ (5.59 ) $ (3.01 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Years Ended December 31, 2018 2017 2016 Options to purchase common stock 436 436 536 RSUs 834 568 429 Common stock subject to repurchase — — 1 Total 1,270 1,004 966

Note 14 - Segment Reporting (Ta

Note 14 - Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	December 31, 2018 2017 United States of America $ 11,483 $ 15,069 International 332 490 Total long-lived assets, net $ 11,815 $ 15,559

Note 15 - Commitments and Con_2

Note 15 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year Ending Operating Lease Expense Operating Sublease Income December 31, 2019 $ 8,239 $ 2,249 December 31, 2020 3,691 1,768 December 31, 2021 3,427 1,105 December 31, 2022 2,194 616 December 31, 2023 362 — Thereafter 90 — Total $ 18,003 $ 5,738

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual) shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018USD ($)shares	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)Rateshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)	Oct. 05, 2017shares	Oct. 04, 2017shares	Dec. 31, 2015USD ($)
Net Income (Loss) Attributable to Parent, Total			$ (41,244)	$ (31,491)	$ (16,480)
Retained Earnings (Accumulated Deficit), Ending Balance	$ (264,713)		(264,713)	(227,704)		$ 4,235
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 11,503		$ 11,503	$ 28,837	35,713				$ 37,326
Common Stock, Shares Authorized | shares	142,857		142,857	142,857			142,857	500,000
Financing Receivable, Allowance for Credit Losses, Ending Balance	$ 353		$ 353	$ 799
Payments to Develop Software			2,129	2,068	4,712
Amortization, Total			3,774	3,669	2,988
Capitalized Computer Software, Net, Ending Balance	6,972		$ 6,972	8,617
Number of Reporting Units			1
Goodwill, Impairment Loss	0	$ 14,740	$ 14,740	2,797
Impairment of Long-Lived Assets Held-for-use			0	0	0
Marketing and Advertising Expense, Total			494	758	876
Foreign Currency Transaction Gain (Loss), before Tax, Total			205	(1,029)	(3)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total			$ 0	0	$ 0
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			2 years
Minimum [Member] | Accounting Standards Update 2016-02 [Member]
Finance and Operating Leases, Right-of-Use Asset	15,500		$ 15,500
Finance and Operating Leases, Liability	17,500		$ 17,500
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			6 years
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Finance and Operating Leases, Right-of-Use Asset	16,500		$ 16,500
Finance and Operating Leases, Liability	18,500		$ 18,500
Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life			3 years
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	$ 2,806		$ 2,806	$ 8,831
Accounts Receivable [Member] | One Long -Term Strategic Agreement Concentration Risk [Member]
Concentration Risk, Percentage			30.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers				0
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Number of Major Customers			0	0	0
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio | Rate			700.00%

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balances	$ 4,028	$ 3,510	$ 2,188
Additions to expense	48	1,507	2,328
Write-offs and other deductions	(1,425)	(989)	(1,006)
Balances	$ 2,651	$ 4,028	$ 3,510

Note 3 - Revenues 1 (Details Te

Note 3 - Revenues 1 (Details Textual) - USD ($)	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retained Earnings (Accumulated Deficit), Ending Balance	$ 4,235,000	$ (264,713,000)	$ (227,704,000)
Revenue from Contract with Customer, Including Assessed Tax		$ 58,631,000	74,991,000	$ 99,878,000
Individual Customer Advances Used or Refunded to Customer, Period		180 days
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized	1,445,000
Contract with Customer, Asset, Net, Total	$ 558,000	$ 432,000
Contract with Customer, Liability, Revenue Recognized		213,000
Contract with Customer, Liability, Total		$ 934
Deferred Costs to Fulfill Contracts, Expected Period of Benefit		3 years
Accrued Expense and Other Current Liabilities [Member]
Contract with Customer, Liability, Total		$ 934,000
Google LLC [Member]
Revenue from Contract with Customer, Including Assessed Tax		2,933,000
Accounts Receivable, Net, Total		$ 3,867,000

Note 3 - Revenues 2 (Details Te

Note 3 - Revenues 2 (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer, Including Assessed Tax	$ 58,631	$ 74,991	$ 99,878
Google LLC [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,933
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Google LLC [Member]
Revenue from Contract with Customer, Including Assessed Tax	11,709
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Google LLC [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 8,781

Note 3 - Revenues - Disaggregat

Note 3 - Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total revenues, net		$ 58,631	$ 74,991	$ 99,878
Subscription and Circulation [Member]
Total revenues, net		54,532	73,453	97,486
Strategic Agreements [Member]
Total revenues, net		4,099	1,538	2,392
UNITED STATES
Total revenues, net		40,907	49,637	69,220
UNITED KINGDOM
Total revenues, net		7,664	9,556	11,083
Other [Member]
Total revenues, net	[1]	$ 10,060	$ 15,798	$ 19,575
[1]	No individual country within the "Other" category accounted for 10% or more of revenues, net for any period presented.

Note 3 - Revenues - Summary of

Note 3 - Revenues - Summary of Changes in Balances of Deferred Costs to Obtain and Fulfill Contracts (Details) - Accounting Standards Update 2014-09 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Costs to Obtain Contracts [Member]
Balances, as adjusted for adoption of ASC 606	$ 1,760
Costs deferred	1,094
Amortization	(1,441)
Balances, as adjusted for adoption of ASC 606	1,413
Costs to Fulfill Contracts [Member]
Balances, as adjusted for adoption of ASC 606	880
Costs deferred	330
Amortization	(604)
Balances, as adjusted for adoption of ASC 606	$ 606

Note 3 - Revenues - Impact of N

Note 3 - Revenues - Impact of New Accounting Pronouncement on Consolidated Financial Statements (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Assets
Prepaid expenses and other current assets	$ 4,642,000		$ 4,642,000	$ 3,989,000
Other non-current assets	2,045,000		2,045,000	1,504,000
Liabilities
Accrued expenses and other current liabilities	9,383,000		9,383,000	10,474,000
Stockholders' equity
Accumulated deficit	(264,713,000)		(264,713,000)	(227,704,000)		$ 4,235,000
Revenues, net			58,631,000	74,991,000	$ 99,878,000
Cost of revenues			27,154,000	32,520,000	35,203,000
Gross profit			31,477,000	42,471,000	64,675,000
Operating expenses
Sales and marketing			23,425,000	26,936,000	32,889,000
Research and development			22,450,000	26,564,000	27,841,000
General and administrative			13,113,000	16,444,000	19,890,000
Impairment of goodwill	0	$ 14,740,000	14,740,000	2,797,000
Total operating expenses			73,728,000	72,741,000	80,620,000
Loss from operations			(42,251,000)	(30,270,000)	(15,945,000)
Other income, net			1,593,000	(214,000)	869,000
Loss before provision for income taxes			(40,658,000)	(30,484,000)	(15,076,000)
Provision for income taxes			(586,000)	(1,007,000)	(1,404,000)
Net loss			$ (41,244,000)	$ (31,491,000)	$ (16,480,000)
Net loss per share available to common stockholders, basic and diluted (in dollars per share)			$ (7.13)	$ (5.59)	$ (3.01)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets
Prepaid expenses and other current assets	3,482,000		$ 3,482,000
Other non-current assets	1,186,000		1,186,000
Liabilities
Accrued expenses and other current liabilities	12,125,000		12,125,000
Stockholders' equity
Accumulated deficit	(267,456,000)		(267,456,000)
Revenues, net			59,352,000
Cost of revenues			26,880,000
Gross profit			32,472,000
Operating expenses
Sales and marketing			23,078,000
Research and development			22,450,000
General and administrative			13,113,000
Impairment of goodwill			14,740,000
Total operating expenses			73,381,000
Loss from operations			(40,909,000)
Other income, net			1,593,000
Loss before provision for income taxes			(39,316,000)
Provision for income taxes			(586,000)
Net loss			$ (39,902,000)
Net loss per share available to common stockholders, basic and diluted (in dollars per share)			$ (6.90)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets
Prepaid expenses and other current assets	1,160,000		$ 1,160,000
Other non-current assets	859,000		859,000
Liabilities
Accrued expenses and other current liabilities	(2,742,000)		(2,742,000)
Stockholders' equity
Accumulated deficit	$ 2,743,000		2,743,000
Revenues, net			(721,000)
Cost of revenues			274,000
Gross profit			(995,000)
Operating expenses
Sales and marketing			347,000
Research and development
General and administrative
Impairment of goodwill
Total operating expenses			347,000
Loss from operations			(1,342,000)
Other income, net
Loss before provision for income taxes			(1,342,000)
Provision for income taxes
Net loss			$ (1,342,000)
Net loss per share available to common stockholders, basic and diluted (in dollars per share)			$ (0.23)

Note 4 - Restructuring Activi_2

Note 4 - Restructuring Activities (Details Textual) - USD ($) $ in Thousands	Jan. 24, 2018	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
The 2018 Restructuring Plan [Member]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	13.00%
Restructuring Costs, Total		$ 1,276
Restructuring and Related Cost, Cost Incurred to Date		0
The 2016 Restructuring Plan [Member]
Restructuring Costs, Total			$ 596
Restructuring and Related Cost, Cost Incurred to Date		$ 0		$ 0

Note 5 - Balance Sheet Compon_3

Note 5 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation, Depletion and Amortization, Total	$ 6,432	$ 8,427	$ 9,023

Note 5 - Balance Sheet Compon_4

Note 5 - Balance Sheet Components - Components of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property and equipment, gross	$ 60,217	$ 60,071
Property and equipment, gross	60,217	60,071
Less: Accumulated depreciation and amortization	(48,402)	(44,512)
Property and equipment, net	11,815	15,559
Computer Equipment [Member]
Property and equipment, gross	27,781	29,938
Property and equipment, gross	$ 27,781	29,938
Computer Equipment [Member] | Minimum [Member]
Estimated useful life of property and equipment (Year)	3 years
Computer Equipment [Member] | Maximum [Member]
Estimated useful life of property and equipment (Year)	4 years
Software, Including Internally Developed Software [Member]
Estimated useful life of property and equipment (Year)	3 years
Property and equipment, gross	$ 25,518	23,389
Property and equipment, gross	25,518	23,389
Leasehold Improvements [Member]
Property and equipment, gross	4,778	4,617
Property and equipment, gross	4,778	4,617
Office Equipment, Furniture and Fixtures [Member]
Property and equipment, gross	2,140	2,127
Property and equipment, gross	$ 2,140	$ 2,127
Office Equipment, Furniture and Fixtures [Member] | Minimum [Member]
Estimated useful life of property and equipment (Year)	5 years
Office Equipment, Furniture and Fixtures [Member] | Maximum [Member]
Estimated useful life of property and equipment (Year)	5 years

Note 5 - Balance Sheet Compon_5

Note 5 - Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Accrued salary and payroll-related expenses	$ 3,695,000	$ 4,372,000
Deferred strategic agreement revenues (Note 3)	934
Income taxes payable	883,000	142,000
Accrued liabilities	866,000	2,161,000
Deferred rent	538,000	475,000
Sales and use tax payable	244,000	341,000
Other	932,000	521,000
Accrued expenses and other current liabilities	9,383,000	10,474,000
Advance Billings [Member]
Advanced billings	859,000	459,000
Customer Advance [Member]
Advanced billings	$ 432,000	$ 2,003,000

Note 6 - Goodwill and Intangi_3

Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill, Ending Balance	$ 1,943		$ 1,943	$ 16,768
Goodwill, Impairment Loss	$ 0	$ 14,740	14,740	2,797
Amortization of Intangible Assets, Total			$ 2,537	$ 2,850	$ 3,080

Note 6 - Goodwill and Intangi_4

Note 6 - Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance			$ 16,768
Impairment	$ 0	$ (14,740)	(14,740)	$ (2,797)
Foreign currency translation adjustments			(85)
Balance	$ 1,943		$ 1,943	$ 16,768

Note 6 - Goodwill and Intangi_5

Note 6 - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible assets, gross	$ 11,990	$ 14,670
Less: accumulated amortization	(10,052)	(10,195)
Total	$ 1,938	4,475
Minimum [Member]
Intangible assets amortized useful lives (Year)	2 years
Maximum [Member]
Intangible assets amortized useful lives (Year)	6 years
Developed Technology Rights [Member]
Intangible assets, gross	$ 9,910	9,910
Developed Technology Rights [Member] | Minimum [Member]
Intangible assets amortized useful lives (Year)	5 years
Developed Technology Rights [Member] | Maximum [Member]
Intangible assets amortized useful lives (Year)	6 years
Customer Relationships [Member]
Intangible assets amortized useful lives (Year)	4 years
Intangible assets, gross	$ 2,080	3,370
Non-compete Agreements and Tradename [Member]
Intangible assets amortized useful lives (Year)	3 years
Intangible assets, gross		$ 1,390

Note 6 - Goodwill and Intangi_6

Note 6 - Goodwill and Intangible Assets - Schedule of Future Estimated Amortization Costs of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Year ending December 31, 2019	$ 1,843
Year ending December 31, 2020	95
Total	$ 1,938	$ 4,475

Note 7 - Fair Value Measureme_3

Note 7 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 0	$ 0

Note 7 - Fair Value Measureme_4

Note 7 - Fair Value Measurements - Account Balances Measured at Fair Value on Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Money market funds	$ 2,806	$ 8,831
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds	2,806	8,831
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Money market funds

Note 8 - Capital Lease Obliga_3

Note 8 - Capital Lease Obligations (Details Textual) $ in Thousands	1 Months Ended
	Sep. 30, 2016	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Oct. 31, 2016
Net Value of Property Plant and Equipment Obtained under Capital Lease Agreements		$ 2,003	$ 2,861
Capital Lease Obligations, Total		$ 1,798	$ 3,103
Capital Lease for Acquisition of Computer Equipment [Member]
Debt Instrument, Interest Rate, Effective Percentage				5.20%
Number of Installments of Repayment of Debt				48
Number of Capital Lease Arrangements	2
Minimum [Member] | Capital Lease for Acquisition of Computer Equipment [Member]
Debt Instrument, Interest Rate, Effective Percentage		5.70%
Number of Installments of Repayment of Debt		36
Maximum [Member] | Capital Lease for Acquisition of Computer Equipment [Member]
Debt Instrument, Interest Rate, Effective Percentage		7.90%
Number of Installments of Repayment of Debt		48

Note 8 - Capital Lease Obliga_4

Note 8 - Capital Lease Obligations - Maturities of Outstanding Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
December 31, 2019	$ 1,324
December 31, 2020	552
December 31, 2021	11
Total	1,887
Present value of capital lease obligations	1,798	$ 3,103
Less: Current portion of capital lease obligations	(1,249)	(1,416)
Non-current portion of capital lease obligations	$ 549	$ 1,687

Note 9 - Common Stock (Details

Note 9 - Common Stock (Details Textual) - $ / shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017	Oct. 05, 2017	Oct. 04, 2017
Common Stock, Shares Authorized	142,857	142,857	142,857	500,000
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	10,000	10,000
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001

Note 9 - Common Stock - Reserve

Note 9 - Common Stock - Reserved Shares of Common Stock (Details) - shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options outstanding under stock option plans (in shares)	436	436	536	851
Total (in shares)	2,319	2,185
Stock Options Plans [Member]
Number of Shares Available for Grant (in shares)	896	999
Options outstanding under stock option plans (in shares)	436	436
Stock Options Plans [Member] | Restricted Stock Units (RSUs) [Member]
RSUs outstanding under stock option plans (in shares)	834	568
Employee Stock Purchase Plan [Member]
Number of Shares Available for Grant (in shares)	153	182

Note 10 - Equity Award Plans (D

Note 10 - Equity Award Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2013
Common Stock, Capital Shares Reserved for Future Issuance		2,319	2,185
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period, Reason Other than Disability or Death		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Exercise Period, Due to Disability or Death		12 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 328
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 778	$ 1,451	$ 5,424
Stock Issued During Period, Shares, Employee Stock Purchase Plans		86	43
The 2013 Employee Stock Purchase Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance					143
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum		1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		100
Subsequent Event [Member] | The 2013 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease), Total	59
The2013 Equity Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance					643
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum		5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
The2013 Equity Incentive Plan [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease), Total	297

Note 10 - Equity Award Plans -

Note 10 - Equity Award Plans - Summary of Activity Under the 2006 Plan and 2013 Plan (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Shares, Options Outstanding, Balance (in shares)	436	536	851
Weighted Average Exercise Price Per Share, Options Outstanding, Balance (in dollars per share)					$ 29.01	$ 37.60	$ 43.83	$ 53.06
Weighted Average Remaining Contractual Term, Options Outstanding (Year)	6 years 288 days	7 years 14 days	7 years 175 days	7 years 310 days
Aggregate Intrinsic Value, Options Outstanding, Balance					$ 65		$ 194	$ 957
Number of Shares, Options Granted (in shares)	122	79	172
Weighted Average Exercise Price Per Share, Options granted (in dollars per share)	$ 7.06	$ 11.66	$ 18.62
Weighted Average Remaining Contractual Term, Options granted (Year)	7 years 339 days	9 years 127 days	6 years 299 days
Number of Shares, Options Exercised (in shares)			(38)
Weighted Average Exercise Price Per Share, Options exercised (in dollars per share)			$ 10.36
Number of Shares, Options Forfeited and Cancelled (in shares)	(122)	(179)	(449)
Weighted Average Exercise Price Per Share, Options forfeited and cancelled (in dollars per share)	$ 37.55	$ 44.82	$ 54.53
Options outstanding under stock option plans (in shares)	436	536	851	851	436	436	536	851
Number of Shares, Options Outstanding, Balance (in shares)	436	436	536	851
Number of Shares, Options Exercisable, Balance (in shares)					289
Weighted Average Exercise Price Per Share, Options exercisable, Balance (in dollars per share)					$ 38.65
Weighted Average Remaining Contractual Term, Options exercisable (Year)	5 years 277 days
Number of Shares, Options Vested, Balance (in shares)					289
Weighted Average Exercise Price Per Share, Options vested, Balance (in dollars per share)					$ 38.64
Weighted Average Remaining Contractual Term, Options vested (Year)	5 years 277 days
Options vested and expected to vest (in shares)					423
Weighted Average Exercise Price Per Share, Options vested and expected to vest, Balance (in dollars per share)					$ 29.58
Weighted Average Remaining Contractual Term, Options vested and expected to vest (Year)	6 years 266 days

Note 10 - Equity Award Plans _2

Note 10 - Equity Award Plans - Summary of RSUs Granted and Unvested Under the 2013 Plan (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Granted and unvested, Number of shares (in shares)	568	429	175
Granted and unvested, Weighted average grant date fair value (in dollars per share)	$ 14.22	$ 21.48	$ 65.52
RSUs granted, Number of shares (in shares)	709	405	446
RSUs granted, Weighted average grant date fair value (in dollars per share)	$ 6.34	$ 10.56	$ 18.76
RSUs vested, Number of shares (in shares)	(123)	(78)	(30)
RSUs vested, Weighted average grant date fair value (in dollars per share)	$ 14.87	$ 21.29	$ 50.33
RSUs cancelled, Number of shares (in shares)	(320)	(188)	(162)
RSUs cancelled, Weighted average grant date fair value (in dollars per share)	$ 12.75	$ 19.97	$ 30.80
Granted and unvested, Number of shares (in shares)	834	568	429
Granted and unvested, Weighted average grant date fair value (in dollars per share)	$ 7.99	$ 14.22	$ 21.48

Note 11 - Stock-based Compens_3

Note 11 - Stock-based Compensation Expense (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Total	$ 3,971	$ 4,704	$ 10,295
Proceeds from Stock Options Exercised	0	0	$ 390	$ 390
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 518	$ 934
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 292 days	1 year 219 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 182 days	2 years 36 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 4,852	$ 6,428

Note 11 - Stock-based Compens_4

Note 11 - Stock-based Compensation - Assumptions Used to Estimate Fair Value of Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividend yield
Expected volatility	55.90%	47.30%	47.50%
Risk-free interest rate	2.54%	2.03%	1.38%
Expected life of options (Year)	4 years	6 years 91 days	6 years 91 days
Weighted-average grant-date fair value (in dollars per share)	$ 3.20	$ 5.61	$ 8.82
Weighted-average grant-date exercise price (in dollars per share)	$ 7.06	$ 11.66	$ 18.62

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	34.00%	34.00%
Cumulative Change in Ownership, Percentage	50.00%
Cumulative Change in Ownership, Period	3 years
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,402	$ 8,158	$ 469
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,203	1,610
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0	0	$ 0
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Rate Deferred Tax Asset Provisional Income Tax Benefit	18,696
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Rate Deferred Tax Liability Provisional Income Tax Benefit	4,394
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Rate Valuation Allowance Provisional Income Tax Benefit		$ 14,302
Federal Research and Development [Member]
Tax Credit Carryforward, Amount	$ 6,328
Tax Credit Carryforward, Expiration Year	2026
State Research and Development [Member]
Tax Credit Carryforward, Amount	$ 7,084
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 117,816
Operating Loss Carry Forwards, Expiration Year	2026
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 98,993
Operating Loss Carry Forwards, Expiration Year	2022

Note 12 - Income Taxes - Schedu

Note 12 - Income Taxes - Schedule of Components of Loss Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States of America	$ (25,375)	$ (15,740)	$ (7,595)
International	(15,283)	(14,744)	(7,481)
Loss before provision for income taxes	$ (40,658)	$ (30,484)	$ (15,076)

Note 12 - Income Taxes - Sche_2

Note 12 - Income Taxes - Schedule of Components of Provision of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal, Current income tax provision
State, Current income tax provision	44	64	58
Foreign, Current income tax provision	940	1,301	1,708
Total, Current income tax provision	984	1,365	1,766
Federal, Deferred income tax benefit
State, Deferred income tax benefit
Foreign, Deferred income tax benefit	(398)	(358)	(362)
Total, Deferred income tax benefit	(398)	(358)	(362)
Provision for income taxes	$ 586	$ 1,007	$ 1,404

Note 12 - Income Taxes - Differ

Note 12 - Income Taxes - Differences in Total Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax benefit at U.S. statutory rate	$ (8,538)	$ (10,365)	$ (5,126)
Foreign income and withholding taxes	4,247	5,578	4,317
Other permanent differences	3,807	974
State income taxes, net of federal benefit	(1,766)	(2,858)	(147)
Change in valuation allowance	1,402	(8,158)	155
Stock-based compensation	847	1,085	2,231
Research and development credits	(822)	(382)	(736)
Provision to return adjustments	658	153	(484)
Uncertain tax positions	224	1,995	1,146
Impact of change to U.S. statutory rate from Tax Cuts and Jobs Act		14,302
Recognition of tax windfalls related to stock-based compensation		(1,291)
Other	527	(26)	48
Provision for income taxes	$ 586	$ 1,007	$ 1,404

Note 12 - Income Taxes - Sche_3

Note 12 - Income Taxes - Schedule of Components of Company's Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Net operating loss	$ 27,192	$ 25,002
Research and development credits	9,308	8,757
Stock-based compensation	2,519	2,796
Accruals and reserves	513	1,656
Property and equipment and intangible assets	(342)	(710)
Other	3,272	3,161
Net deferred tax assets	42,462	40,662
Valuation allowance	(42,626)	(41,224)
Total non-current net deferred tax liabilities, net of valuation allowance	$ (164)	$ (562)

Note 12 - Income Taxes - Change

Note 12 - Income Taxes - Changes in Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 8,424	$ 8,796	$ 7,558
Decrease in balances related to tax positions taken during the current period		(9)	(2)
Increase in balances related to tax positions taken during the prior period			1,240
Increase in balances related to tax positions taken during the current period	778	1,738
Decrease in balances due to change in United States statutory rate		(2,101)
Decrease in balances related to tax positions taken during the prior period	(812)
Balance	$ 8,390	$ 8,424	$ 8,796

Note 13 - Net Loss Per Share _3

Note 13 - Net Loss Per Share Available to Common Stockholders - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net loss	$ (41,244)	$ (31,491)	$ (16,480)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted (in shares)	5,783	5,638	5,474
Net loss per share available to common stockholders:
Net loss per share available to common stockholders, basic and diluted (in dollars per share)	$ (7.13)	$ (5.59)	$ (3.01)

Note 13 - Net Loss Per Share _4

Note 13 - Net Loss Per Share Available to Common Stockholders - Potential Common Shares Outstanding (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Potential common shares outstanding (in shares)	1,270	1,004	966
Options to Purchase Common Stock [Member]
Potential common shares outstanding (in shares)	436	436	536
Restricted Stock Units (RSUs) [Member]
Potential common shares outstanding (in shares)	834	568	429
Common Stock Subject to Repurchase [Member]
Potential common shares outstanding (in shares)			1

Note 14 - Segment Reporting - R

Note 14 - Segment Reporting - Revenues by Geographic Area, Based on Billing Location of Customer and Long-Lived Assets, by Geographical Areas (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long-lived assets, net	$ 11,815	$ 15,559
UNITED STATES
Long-lived assets, net	11,483	15,069
International [Member]
Long-lived assets, net	$ 332	$ 490

Note 15 - Commitments and Con_3

Note 15 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Aug. 31, 2018ft²
Operating Leases, Rent Expense, Net, Total	$ 8,420	$ 8,519	$ 8,760
Operating Leases, Rent Expense, Sublease Rentals	1,463	1,096	753
Estimated Litigation Liability	$ 0	$ 0	$ 0
Sublease Additional of San Francisco Office Space to Unrelated Third Party [Member]
Area of Real Estate Property | ft²				14,380

Note 15 - Commitments and Con_4

Note 15 - Commitments and Contingencies - Annual Future Minimum Payments Under Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
December 31, 2019	$ 8,239
December 31, 2019	2,249
December 31, 2020	3,691
December 31, 2020	1,768
December 31, 2021	3,427
December 31, 2021	1,105
December 31, 2022	2,194
December 31, 2022	616
December 31, 2023	362
December 31, 2023
Thereafter	90
Thereafter
Total	18,003
Total	$ 5,738

Note 16 - Employee Benefit Pl_2

Note 16 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0	$ 0	$ 0
UNITED KINGDOM
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 87	$ 75	$ 85