Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for doubtful accounts	$ 357	$ 692
Accrued liabilities and other	3,156	2,807
Stock-based compensation expense	910	569
Net federal, state and foreign operating loss carryforwards	1,292	1,039
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	1,207	0
Deferred tax assets	6,922	5,107
Valuation allowance on deferred tax assets	(1,320)	(1,194)
Deferred tax liabilities:
Intangible assets, property and equipment, principally due to difference in depreciation and amortization	7,668	7,519
Net deferred tax liabilities	$ (2,066)	$ (3,606)