Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of Loss Before Provision for Income Taxes

The components of loss before provision for income taxes are as follows (in thousands):

	Year Ended December 31,
	2017			2016			2015
U.S.	$	(115,674	)	$	(107,685	)	$	(85,928	)
Foreign	3,518			4,879			2,214
Total	$	(112,156	)	$	(102,806	)	$	(83,714	)

Schedule of Income Tax Provision

The income tax provision is composed of the following (in thousands):

	Year Ended December 31,
	2017			2016			2015
Current tax provision:
Federal	$	(2,636	)	$	—		$	1
State	104			74			(3		)
Foreign	1,476			3,096			1,693
	(1,056		)	3,170			1,691
Deferred tax provision:
Federal	—			(49		)	(16		)
State	—			—			—
Foreign	(462		)	(2,128		)	(1,337		)
Total provision for (benefit from) income taxes	$	(1,518	)	$	993		$	338

Schedule of Significant Components of Deferred Tax Assets

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

	As of December 31,
	2017			2016
Deferred tax assets:
Tax credit carryforward	$	733		$	762
Net operating loss carryforward	115,237			73,611
Share-based compensation	6,072			13,306
Accrued liabilities and reserves	3,968			4,877
Other	5,086			5,325
Total deferred tax assets	131,096			97,881
Less: valuation allowance	(126,321		)	(92,125		)
Deferred tax assets, net of valuation allowance	4,775			5,756
Deferred tax liabilities:
Depreciation and amortization	(3,053		)	(4,474		)
Net deferred tax assets	$	1,722		$	1,282

Schedule of Reconciliation of the Statutory Federal Income Tax Rate and the Effective Tax Rates

The following is a reconciliation of the statutory federal income tax rate and the effective tax rates:

	Year Ended December 31,
	2017		2016		2015
Tax at federal statutory rate	34.0	%	34.0	%	34.0	%
Tax reform rate change impact	(58.2	)	—		—
Excess tax benefit from share-based compensation	42.8		—		—
Valuation allowance	(20.7	)	(23.3	)	(29.2	)
Share-based compensation	6.4		(6.1	)	(5.5	)
Other	(4.4	)	0.3		0.3
Benefit from other comprehensive gain	1.5		—		—
Intercompany dividend	—		(5.9	)	—
Effective tax rate	1.4	%	(1.0	)%	(0.4	)%

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) for the two years ending December 31, 2017 is as follows (in thousands):

Balance at December 31, 2014	$	5,955
Decrease from tax positions related to the prior year	(57		)
Additions from tax positions related to the current year	2,605
Lapse of statutes of limitations	—
Balance at December 31, 2015	$	8,503
Additions from tax positions related to the prior year	279
Additions from tax positions related to the current year	3,639
Decrease related to settlements with taxing authorities	(621		)
Lapse of statutes of limitations	(14		)
Balance at December 31, 2016	11,786
Additions from tax positions related to the current year	4,141
Lapse of statutes of limitations	(283		)
Balance at December 31, 2017	$	15,644