Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of components of income tax provision (benefit)

Components of the income tax expense are as follows (in thousands):

	Year ended December 31,
	2017			2016			2015
Current:
Federal	$	(1,314	)	$	442		$	3,944
State	675			(85		)	390
Foreign	488			(526		)	1,841
Total current	(151		)	(169		)	6,175
Deferred:
Federal	8,701			1,564			(2,628		)
State	337			(112		)	(63		)
Foreign	(45		)	(46		)	(8		)
Total deferred	8,993			1,406			(2,699		)
Income tax expense	$	8,842		$	1,237		$	3,476

Schedule of domestic and foreign net income (loss) before taxes

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

	Year ended December 31,
	2017			2016			2015
United States	$	(2,844	)	$	4,502		$	4,760
Foreign	(1,367		)	(1,358		)	5,874
(Loss) income before income taxes	$	(4,211	)	$	3,144		$	10,634

Schedule of effective income tax rate reconciliation

A reconciliation of the U.S. federal statutory tax rate to the effective income tax rate is as follows:

	Year ended December 31,
	2017		2016		2015
Federal statutory tax rate	(35.0	)%	35.0	%	35.0	%
State income taxes, net of federal benefit	14.2		(5.3	)	2.0
Non-U.S. income taxed at different rates	11.6		1.2		(4.4	)
Impact of 2017 Tax Cuts and Jobs Act	173.6		—		—
Net operating loss carryback adjustment	—		10.0		1.4
Reduction in tax benefit related to stock-based awards	47.2		—		—
Non-deductible expenditures	11.0		13.1		5.9
Research and development credit	(10.8	)	(12.7	)	(3.5	)
Other	(1.8	)	(2.0	)	(3.7	)
Effective income tax rate	210.0	%	39.3	%	32.7	%

Schedule of deferred tax assets and liabilities

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

	December 31,
	2017			2016
Deferred tax assets:
Net operating loss carryforwards	$	24,569		$	21,212
Allowance for doubtful accounts	981			1,582
Inventory valuation reserves	827			2,205
Equity compensation	685			3,161
Goodwill	—			10,788
Accrued compensation	222			80
Foreign tax credit carryforward	3,955			2,365
Other	—			76
Total gross deferred tax assets	31,239			41,469
Valuation allowance	(1,187		)	(1,053		)
Total deferred tax assets, net	30,052			40,416
Deferred tax liabilities:
Property and equipment	(6,216		)	(7,264		)
Intangible assets	(10,084		)	(13,375		)
Goodwill	(365		)	—
Convertible debt	(619		)	(2,010		)
Unearned revenue	(52		)	(4,535		)
Prepaid insurance and other	(3		)	(338		)
Total gross deferred tax liabilities	(17,339		)	(27,522		)
Net deferred tax assets	$	12,713		$	12,894