Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2017	$ 31,430	$ 137,622	$ (916)	$ (105,276)
Balance, Shares at Dec. 31, 2017		12,664,489
Net loss	(2,434)
Balance at Mar. 31, 2018	29,340
Balance at Dec. 31, 2017	31,430	$ 137,622	(916)	(105,276)
Balance, Shares at Dec. 31, 2017		12,664,489
Exercise of stock options	$ 9	$ 9
Exercise of stock options, Shares	2,422	2,422
Share-based compensation, including issuance of restricted stock	$ 678	$ 678
Share-based compensation, including issuance of restricted stock, Shares		113,535
Shares of restricted stock withheld for taxes	(10)	$ (10)
Shares of restricted stock withheld for taxes, Shares		2,873
Net loss	(13,737)			(13,737)
Foreign currency translation adjustment, net of tax	(36)	$ (19)	(17)
Unrealized gain on investments, net of tax	7		7
Balance at Dec. 31, 2018	$ 18,341	$ 138,280	(926)	(119,013)
Balance, Shares at Dec. 31, 2018	12,777,573	12,777,573
Balance at Mar. 31, 2018	$ 29,340
Net loss	(3,683)
Balance at Jun. 30, 2018	25,635
Net loss	(2,087)
Balance at Sep. 30, 2018	23,858
Net loss	(5,533)
Balance at Dec. 31, 2018	$ 18,341	$ 138,280	(926)	(119,013)
Balance, Shares at Dec. 31, 2018	12,777,573	12,777,573
Net loss	$ (2,846)
Balance at Mar. 31, 2019	15,673
Balance at Dec. 31, 2018	$ 18,341	$ 138,280	(926)	(119,013)
Balance, Shares at Dec. 31, 2018	12,777,573	12,777,573
Exercise of stock options, Shares		264,720
Share-based compensation, including issuance of restricted stock	$ 519	$ 519
Shares of restricted stock withheld for taxes	(24)	(24)
Net loss	(9,181)			(9,181)
Foreign currency translation adjustment, net of tax	39	102	(63)
Unrealized gain on investments, net of tax	2		2
Balance at Dec. 31, 2019	$ 9,696	$ 138,877	(987)	(128,194)
Balance, Shares at Dec. 31, 2019	13,042,293	13,042,293
Balance at Mar. 31, 2019	$ 15,673
Net loss	(3,868)
Balance at Jun. 30, 2019	11,835
Net loss	(1,107)
Balance at Sep. 30, 2019	10,888
Net loss	(1,360)
Balance at Dec. 31, 2019	$ 9,696	$ 138,877	$ (987)	$ (128,194)
Balance, Shares at Dec. 31, 2019	13,042,293	13,042,293