Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Loss before income taxes

Our loss before income taxes consists of the following (in thousands):

	Year Ended December 31,
	2016			2015			2014
Domestic	$	(65,211	)	$	(46,757	)	$	(41,559	)
International	(14,966		)	(8,033		)	(16,146		)
Loss before income taxes	$	(80,177	)	$	(54,790	)	$	(57,705	)

Significant components of provision for income taxes

Significant components of our benefit for income taxes are as follows (in thousands):

	Year Ended December 31,
	2016			2015			2014
Current:
Federal	$	—		$	(30	)	$	—
State	(14		)	(14		)	(20		)
Foreign	286			(1,319		)	(254		)
Total current tax benefit (expense)	272			(1,363		)	(274		)
Deferred:
State	—			—			2,042
Foreign	3,920			2,838			3,107
Total deferred benefit	3,920			2,838			5,149
Total benefit for income taxes	$	4,192		$	1,475		$	4,875

Reconciliation of income taxes at statutory rate to (provision for)/benefit from income taxes recorded in statements of operations

Reconciliation of income taxes at the statutory rate to the benefit from (provision for) income taxes recorded in the statements of operations is as follows:

	Year Ended December 31,
	2016		2015		2014
Tax benefit at federal statutory rate	34.0	%	34.0	%	34.0	%
State tax credit (expense), net of federal benefit	2.2		1.4		(1.5	)
Foreign tax expense	(0.7	)	(1.9	)	(3.7	)
Change in valuation allowance	(31.2	)	(28.6	)	(21.1	)
Federal research and development credit	1.3		2.6		2.7
Unrecognized tax benefit	(1.3	)	(1.8	)	(0.7	)
Return to provision reconciliation	1.5		(1.2	)	—
Other, net	(0.6	)	(1.9	)	(1.2	)
Effective tax rate	5.2	%	2.6	%	8.5	%

Significant components of deferred tax assets and liabilities

Significant components of our deferred tax assets and liabilities are as follows (in thousands):

	December 31,
	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	123,913		$	104,291
Reserves and accruals	4,281			2,922
Depreciation and amortization	712			548
Tax credit carryforwards	12,584			11,098
Stock-based compensation	7,057			7,185
Total gross deferred tax assets	148,547			126,044
Valuation allowance on deferred tax assets	(146,285		)	(124,137		)
Total deferred tax assets, net of valuation allowance	2,262			1,907
Deferred tax liabilities:
Fixed asset and intangibles	(22,000		)	(25,565		)
Total deferred tax liabilities	(22,000		)	(25,565		)
Net deferred tax liability	$	(19,738	)	$	(23,658	)

Summary of valuation allowance

A reconciliation of the beginning and ending amount of the valuation allowance for the years ended December 31, 2016, 2015 and 2014 is as follows (in thousands):

	Valuation Allowance
December 31, 2013	$	96,275
Charges to earnings	—
Charges to other accounts	13,892
December 31, 2014	110,167
Charges to earnings	—
Charges to other accounts	13,970
December 31, 2015	124,137
Charges to earnings	—
Charges to other accounts	22,148
December 31, 2016	$	146,285

Aggregate changes in balance of gross unrecognized tax benefits

The aggregate changes in the balance of our gross unrecognized tax benefits during 2016, 2015, and 2014 were as follows (in thousands):

December 31, 2013	$	6,848
Increases in balances related to tax positions taken during current period	832
Decreases in balances related to tax position taken during prior period	(8		)
December 31, 2014	7,672
Increases in balances related to tax positions taken during current period	1,049
Decreases in balances related to tax positions taken during prior period	(59		)
December 31, 2015	8,662
Increases in balances related to tax positions taken during a prior period	46
Increases in balances related to tax positions taken during current period	1,673
Decreases in balances related to tax positions taken during prior period	(1,048		)
December 31, 2016	$	9,333