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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of (Loss) Income Before Provision for Income Taxes

(Loss) income before provision for income taxes was as follows:

		Year Ended December 31,
		2018				2017				2016
		(in thousands)
United States		$	(69,769	)		$	(54,894	)		$	(47,112	)
Foreign			7,809				4,855				2,083
Total		$	(61,960	)		$	(50,039	)		$	(45,029	)

Components of Income Tax (Provision) Benefit

The (provision) benefit for income taxes consists of the following:

		Year Ended December 31,
		2018				2017				2016
		(in thousands)
Current income tax provision
Federal		$	(184	)		$	—			$	—
State			(140	)			(144	)			(95	)
Foreign			(1,508	)			(1,077	)			(579	)
Total current income tax provision			(1,832	)			(1,221	)			(674	)
Deferred income tax benefit
Federal			21				10,435				61
State			—				977				—
Foreign			(57	)			134				80
Total deferred income tax benefit			(36	)			11,546				141
Total income tax benefit (provision)		$	(1,868	)		$	10,325			$	(533	)

Schedule of Differences Between Income Taxes Computed at the Federal Statutory Rate and the Provision for Income Taxes

The following reconciles the differences between income taxes computed at the federal statutory rate of 21% for 2018 and 35% for 2017 and 2016 and the provision for income taxes:

		Year Ended December 31,
		2018				2017				2016
		(in thousands)
Expected income tax benefit at the federal statutory rate		$	12,955			$	17,166			$	15,761
State taxes net of federal benefit			5,155				5,150				916
Stock-based compensation			17,575				10,939				(2,001	)
Difference in foreign tax rates			435				988				415
U.S. tax credits			1,763				1,717				1,609
Convertible debt and acquisition			—				11,573				—
Federal rate change			—				(49,123	)			—
Transition tax			—				(1,063	)			—
GILTI inclusion			(1,177	)			—				—
Meals & entertainment			(1,411	)			(745	)			(612	)
Change in valuation allowance			(37,059	)			13,988				(16,413	)
Other			(104	)			(265	)			(208	)
Income tax benefit (provision)		$	(1,868	)		$	10,325			$	(533	)

Components of the Company's Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities were as follows:

		Year Ended December 31,
		2018				2017
		(in thousands)
Deferred tax assets:
Net operating loss carryforwards		$	118,897			$	87,521
Research and investment credits			11,154				9,402
Accruals and reserves			7,734				6,627
Depreciation			1,119				911
Stock-based compensation			5,404				4,146
Interest expense			2,466				—
Total deferred tax assets			146,774				108,607
Deferred tax liabilities:
Intangible assets			(1,002	)			(1,273	)
Convertible debt			(4,675	)			(5,664	)
Capitalized costs			(8,002	)			(4,648	)
Total deferred tax liabilities			(13,679	)			(11,585	)
Valuation allowance			(132,759	)			(96,630	)
Net deferred tax assets		$	336			$	392

Summary of Activity Related to Unrecognized Tax Benefits

The following summarizes activity related to unrecognized tax benefits:

		Year Ended December 31,
		2018				2017				2016
		(in thousands)
Unrecognized benefit—beginning of the year		$	2,725			$	1,742			$	673
Gross increases—current period positions			1,200				983				1,069
Gross decrease—prior period positions			—				—				—
Unrecognized benefit—end of period		$	3,925			$	2,725			$	1,742

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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