Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes

Schedule of pretax loss

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Loss before provision (benefit) for income taxes:
Domestic	$	(57,513	)	$	(46,908	)	$	(37,481	)
Foreign		(10,858	)		(8,524	)		(9,851	)
Total	$	(68,371	)	$	(55,432	)	$	(47,332	)

Schedule of provision for income taxes

	Year Ended December 31,
	2015		2014			2013
	(in thousands)
Current tax provision:
Federal	$	1	$	1		$	—
State		24		15			10
Foreign		353		164			83
Total current tax provision		378		180			93
Federal		—		(286	)		—
State		—		(45	)		—
Foreign		330		(326	)		(65	)
Total deferred tax benefit		330		(657	)		(65	)
Total provision (benefit) for income taxes	$	708	$	(477	)	$	28

Schedule of difference between income taxes computed at the federal statutory rate and the provision for income taxes

	Year Ended December 31,
	2015			2014			2013
Federal statutory rate		34.00	%		34.00	%		34.00	%
Stock-based compensation		(1.15	)		(0.74	)		(1.59	)
Valuation allowance		(36.51	)		(34.38	)		(28.31	)
Foreign rate differential		(3.11	)		(2.52	)		(5.00	)
Federal research and development credit		3.28			2.48			1.19
Other		2.42			2.03			(0.35	)
Effective income tax rate		(1.06	)%		0.87	%		(0.06	)%

Schedule of components of deferred tax assets and liabilities

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Deferred tax assets:
Accounts receivable principally due to allowance for doubtful accounts	$	166		$	130		$	92
Compensated absences, principally due to accruals for financial reporting purposes		2,880			1,867			2,993
Net operating loss carryforwards		69,369			54,949			42,704
Federal tax credits		3,657			2,437			1,766
State tax credits net of federal benefit		2,010			1,521			1,166
Other deductible temporary differences		2,234			1,311			964
Stock-based compensation		12,106			7,289			1,508
Foreign Credit		22			24			25
Total deferred tax assets	$	92,444		$	69,528			51,218
Deferred tax liabilities:
Capitalized software development		(566	)		(278	)		(149	)
Acquired intangible assets		(1,208	)		(1,983	)		(1,979	)
Total deferred tax liability		(1,774	)		(2,261	)		(2,128	)
Valuation allowance		(90,892	)		(67,159	)		(49,388	)
Net deferred taxes	$	(222	)	$	108		$	(298	)

Schedule of net operating loss carryforwards

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Federal	$	258,566	$	204,361	$	130,797
State		186,450		146,399		102,606
Foreign		31,015		24,780		17,673
Total	$	476,031	$	375,540	$	251,076

Schedule of research and development credit carryforwards

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Federal	$	3,657	$	2,437	$	1,766
California		3,045		2,305		1,767
International		22		24		25
Total	$	6,724	$	4,766	$	3,558

Schedule of activity related to unrecognized tax benefits

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Unrecognized benefit—beginning of period	$	991	$	472	$	—
Gross increases (decreases)—prior period tax positions		75		34		—
Gross increases (decreases)—current period tax positions		765		485		472
Unrecognized benefit—end of period	$	1,831	$	991	$	472