Condensed Consolidated Statements of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - In Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at beginning of year at Dec. 31, 2016	$ 78,525	$ 17	$ 134,480	$ (55,590)	$ (382)
Cumulative-effect adjustment resulting from adoption of ASU 2016-09 at Dec. 31, 2016	510			510
BALANCE at beginning of year, as adjusted at Dec. 31, 2016	79,035	17	134,480	(55,080)	(382)
Stock-based compensation expense	729	1	728	0	0
Issuance of shares for stock purchase plans	330	0	330	0	0
Cancellation of shares for payment of withholding tax	(614)	0	(614)	0	0
Dividends paid	(865)	0	(865)	0	0
Net loss	(30)	0	0	(30)	0
Foreign currency translation adjustments	51	0	0	0	51
BALANCE at end of year at Mar. 31, 2017	$ 78,636	$ 18	$ 134,059	$ (55,110)	$ (331)