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Income taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income (Loss) Before Income Taxes

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

	Year ended December 31,
	2018				2017				2016
Domestic	$	17,405			$	22,409			$	9,677
Foreign	551				60				135
Total	$	17,956			$	22,469			$	9,812

Schedule of Components of (Provision) Benefit for Income Taxes

The components of the benefit (provision) for income taxes are as follows (in thousands):

	Year ended December 31,
	2018				2017				2016
Current:
U.S. federal	$	(2,414	)		$	(2,058	)		$	(9,978	)
State	(948		)		(369		)		(2,096		)
Foreign	(8		)		—				—
Total current	(3,370		)		(2,427		)		(12,074		)
Deferred:
U.S. federal	1,005				13,246				8,384
State	101				(21		)		(773		)
Foreign	(167		)		208				(36		)
Total deferred	939				13,433				7,575
Total (provision) benefit for income taxes	$	(2,431	)		$	11,006			$	(4,499	)

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

The following table presents a reconciliation of the federal statutory rate to the Company’s effective tax rate:

	Year ended December 31,
	2018			2017			2016
Federal statutory rate	21.0	%		35.0	%		35.0	%
Federal tax deferred rate change	—	%		(53.8	)%		—	%
State tax, net of federal benefit	2.6	%		0.6	%		0.7	%
State tax deferred rate change, net of federal benefit	0.9	%		0.9	%		18.7	%
Nondeductible business expenses	1.4	%		—	%		2.0	%
Provision-to-return adjustment	(3.9	)%		—	%		—	%
Uncertain tax positions	(1.3	)%		(1.7	)%		2.0	%
Stock based compensation	(8.6	)%		(28.1	)%		(16.8	)%
Others	1.4	%		(1.9	)%		4.3	%
Effective tax rate	13.5	%		(49.0	)%		45.9	%

Schedule of Components of Net Deferred Taxes

The deferred tax assets and liabilities are reported in the accompanying balance sheets as follows (in thousands):

	December 31, 2018				December 31, 2017
Deferred tax assets	$	56			$	245
Deferred tax liabilities	20,217				21,341
Net deferred tax liabilities	$	20,161			$	21,096

The components of net deferred taxes arising from temporary differences are as follows (in thousands):

	December 31, 2018				December 31, 2017
Deferred tax assets:
Compensation	$	928			$	1,056
Inventories and receivables	3,008				2,965
Accrued expenses	424				663
Stock compensation	5,175				3,497
Net operating losses	43				210
Other	898				925
Deferred tax assets	10,476				9,316
Deferred tax liabilities:
Goodwill	2,618				2,214
Fixed assets	2,405				1,923
Intangible assets	24,591				25,962
Other	1,023				313
Deferred tax liabilities	30,637				30,412
Net deferred tax liabilities	$	20,161			$	21,096

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	Year ended December 31,
	2018				2017				2016
Balance at beginning of year	$	764			$	1,208			$	1,256
Increases for prior year tax positions	—				63				438
Increases for current year tax positions	173				68				103
Decreases for prior year tax positions	(8		)		(1		)		(589		)
Decreases due to settlements	—				(32		)		—
Decreases due to statutes lapsing	(358		)		(542		)		—
Balance at end of year	$	571			$	764			$	1,208

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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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