Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income (Loss) Before Income Taxes

Income (loss) before income taxes

	Year ended December 31,
	2015			2014			2013
	(in thousands)
U.S.	$	(67,254	)	$	(46,562	)	$	(38,114	)
Foreign		(10,602	)		2,647			2,603
Total	$	(77,856	)	$	(43,915	)	$	(35,511	)

Income Tax Expense (Benefit)

Income taxes

	Year ended December 31,
	2015			2014			2013
	(in thousands)
Current
U.S.	$	—		$	—		$	—
State		—			—			—
Foreign		13			6			6
Total current income tax expense		13			6			6
Deferred
U.S.		—			(218	)		(5,863	)
State		—			(36	)		691
Foreign		(39	)		326			6
Total deferred income tax expense (benefit)		(39	)		72			(5,166	)
Total income tax expense (benefit)	$	(26	)	$	78		$	(5,160	)

Reconciliation of Income Tax Computed at Federal Statutory Rate to Income Before Taxes

The reconciliation of income tax computed at the federal statutory rate to income before taxes is as follows:

	Year ended December 31,
	2015			2014			2013
U.S. Federal statutory rate		(34.0	)%		(34.0	)%		(34.0	)%
State taxes net of federal benefit		(4.4	)		(5.7	)		(5.5	)
Foreign rate differential and transactional tax		1.2			(0.5	)		(0.7	)
Impact of foreign tax holiday		3.4			(1.5	)		(1.8	)
Valuation allowance		33.3			41.8			26.9
Other		0.5			0.1			0.6
		—	%		0.2	%		(14.5	)%

Significant Components of Net Deferred Income Taxes

Significant components of the Company’s net deferred income taxes are as follows at December 31:

	2015			2014
	(in thousands)
Deferred tax assets:
Allowance for doubtful accounts	$	152		$	55
Inventory reserves		3,289			918
Accrued liabilities		382			57
Warrant interest expense		269			269
Stock compensation expense		2,478			2,689
State net operating loss—net of tax		7,456			5,923
Net operating loss carryforward		40,417			31,658
Tax credits		671			581
Valuation allowance		(52,286	)		(27,151	)
Total deferred tax assets		2,828			14,999
Deferred tax liability:
Depreciation		(3,320	)		(15,423	)
Prepaid expenses		(62	)		(169	)
Net deferred tax liability	$	(554	)	$	(593	)