Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Summary of Loss from Operations Before Income Taxes Categorized Geographically

Loss from operations before income taxes is categorized geographically as follows:

	Year Ended December 31,
(in thousands)	2019			2018			2017
United States	$	(81,653	)	$	(152,045	)	$	(40,775	)
Foreign		5,015			(2,547	)		718
Total loss from operations before income taxes	$	(76,638	)	$	(154,592	)	$	(40,057	)

Schedule of Provision for (Benefit from) Income Taxes

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

	Year Ended December 31,
(in thousands)	2019			2018			2017
Current income tax expense:
Federal	$	14		$	(70	)	$	(12	)
State		10			48			23
Foreign		873			677			790
Total current income tax expense		897			655			801
Deferred income tax expense:
Federal		(1,087	)		(483	)		(16,141	)
State		121			562			(248	)
Foreign		(2,710	)		(586	)		(459	)
Total deferred income tax benefit		(3,676	)		(507	)		(16,848	)
Total provision for (benefit from) income taxes	$	(2,779	)	$	148		$	(16,047	)

Summary of Reconciliation of Company's Effective Tax Rate to Federal Statutory Rate

A reconciliation of the Company’s effective tax rate to the federal statutory rate is as follows:

	Year Ended December 31,
(in thousands)	2019			2018			2017
Tax at federal statutory rate	$	(16,094	)	$	(32,464	)	$	(14,020	)
State income tax, net of federal tax benefit		(4,102	)		(6,764	)		(3,898	)
Foreign tax rate differential		(2,651	)		626			(493	)
Stock-based compensation		1,885			2,378			2,645
Transition tax		—			—			2,261
Revaluation of deferred tax assets and liabilities		—			—			(10,259	)
Research and development credits		(2,033	)		(5,247	)		(4,028	)
Other		805			(106	)		659
Change in valuation allowance		19,411			41,725			11,086
Total provision for (benefit from) income taxes	$	(2,779	)	$	148		$	(16,047	)

Summary of Tax Effects of Temporary Differences Portions of Company's Deferred Tax Assets and Liabilities

As of December 31, 2019 and 2018, the tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities are as follows:

(in thousands)	December 31, 2019			December 31, 2018
Deferred tax assets:
Net operating losses	$	66,170		$	41,419
Tax credits		26,254			23,359
Stock-based compensation		22,299			25,208
Accrued compensation and related expenses		3,513			4,061
Financing obligation- leased facility		—			29,842
Lease liabilities		31,355			—
Intangible assets		72,226			—
Other		2,003			463
Total deferred tax assets:		223,820			124,352
Valuation allowance		(174,921	)		(81,127	)
Total deferred tax assets, net of valuation allowance:		48,899			43,225
Deferred tax liabilities:
Depreciation and amortization		(8,708	)		(26,844	)
Goodwill		(23,047	)		(19,307	)
Right-of-use assets		(19,077	)		—
Total deferred tax liabilities:		(50,832	)		(46,151	)
Total net deferred tax liabilities:	$	(1,933	)	$	(2,926	)

Summary of Changes in Balances of Gross Unrecognized Tax Benefits

Changes in balances during 2019 and 2018 and ending balances as of December 31, 2019 and 2018 in gross unrecognized tax benefits were as follows:

(in thousands)	December 31, 2019		December 31, 2018
Beginning balances	$	3,351	$	1,486
Increases related to tax positions taken during a prior year		156		584
Increases related to tax positions taken during the current year		1,398		1,351
Decreases related to tax positions taken during a prior year		—		(70	)
Decreases related to tax settlements with taxing authorities		—		—
Ending balances	$	4,905	$	3,351