Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 291	$ 531
Accrued liabilities and other	2,066	2,564
Stock-based compensation expense	297	296
Net federal, state and foreign operating loss carryforwards	2,825	1,953
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	1,379	266
Deferred tax assets	6,858	5,610
Valuation allowance on deferred tax assets	(4,025)	(1,385)
Deferred tax liabilities:
Other	182	1,181
Intangible assets, property and equipment, principally due to difference in depreciation and amortization	8,969	10,784
Net deferred tax liabilities	$ (6,318)	$ (7,740)