Condensed Consolidated Statements of Stockholders' Equity - Unaudited - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017	$ 54,345	$ 396	$ (1,881)	$ 142,486	$ (86,627)	$ (29)
Beginning balance, shares at Dec. 31, 2017		39,625,980	(842,220)
Impact of the adoption of ASC 606, net of tax	2,456				2,456
Exercise of common stock options, shares		12,546
Stock-based compensation cost	568			568
Vesting of restricted stock units, net of treasury stock, shares		416
Net loss	(2,375)				(2,375)
Other comprehensive loss	(64)					(64)
Ending balance at Mar. 31, 2018	54,930	$ 396	$ (1,881)	143,054	(86,546)	(93)
Ending balance, shares at Mar. 31, 2018		39,638,942	(842,220)
Beginning balance at Dec. 31, 2018	$ 51,171	$ 399	$ (1,899)	144,739	(91,726)	(342)
Beginning balance, shares at Dec. 31, 2018	39,027,572	39,880,054	(852,482)
Exercise of common stock options	$ 37			37
Exercise of common stock options, shares	24,819	24,819
Stock-based compensation cost	$ 347			347
Vesting of restricted stock units, net of treasury stock, shares		416	(125)
Net loss	(2,244)				(2,244)
Other comprehensive loss	(137)					(137)
Ending balance at Mar. 31, 2019	$ 49,174	$ 399	$ (1,899)	$ 145,123	$ (93,970)	$ (479)
Ending balance, shares at Mar. 31, 2019	39,052,682	39,905,289	(852,607)