CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle | ASU 606 [Member]	$ 0	$ 0	$ 655	$ 0	$ 0	$ 655
Balance at Dec. 31, 2017	$ 210	76,802	(42,870)	(1,471)	$ (2,999)	29,672
Balance (in shares) at Dec. 31, 2017	21,024,395				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 0	1,668	0	0	$ 0	1,668
Common stock issued for options exercised (in shares)	219,997
Common stock issued for options exercised	$ 2	134	0	0	0	136
Common stock issued for RSUs vested (in shares)	241,053
Common stock issued for RSUs vested	$ 2	(2)	0	0	0	0
Shares withheld to pay taxes		(484)				(484)
Foreign currency translation adjustment	0	0	0	(164)	0	(164)
Net loss	0	0	(354)	0	0	(354)
Balance at Dec. 31, 2018	$ 214	78,118	(42,569)	(1,635)	$ (2,999)	31,129
Balance (in shares) at Dec. 31, 2018	21,485,445				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 0	1,513	0	0	$ 0	1,513
Common stock issued for options exercised (in shares)	9,011
Common stock issued for options exercised	$ 1	0	0	0	0	1
Common stock issued for RSUs vested (in shares)	344,507
Common stock issued for RSUs vested	$ 3	(3)	0	0	0	0
Shares withheld to pay taxes	0	(228)	0	0	0	(228)
Foreign currency translation adjustment	0	0	0	(211)	0	(211)
Net loss	0	0	(12,085)	0	0	(12,085)
Balance at Dec. 31, 2019	$ 218	$ 79,400	$ (54,654)	$ (1,846)	$ (2,999)	$ 20,119
Balance (in shares) at Dec. 31, 2019	21,838,963				(1,598,911)