Condensed Consolidated Statements of Stockholders' Equity (unaudited) - 3 months ended Mar. 31, 2018 - 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, 2017	$ 83,319	$ 18	$ 134,505	$ (51,258)	$ 54
Cumulative-effect adjustment resulting from adoption of ASU 2016-16 at Dec. 31, 2017	92			92
BALANCE at beginning of year, as adjusted at Dec. 31, 2017	83,411	18	134,505	(51,166)	54
Stock-based compensation expense	668	0	668	0	0
Issuance of shares for stock purchase plans	364	0	364	0	0
Cancellation of shares for payment of withholding tax	(289)	0	(289)	0	0
Dividends paid	(995)	0	(995)	0	0
Net loss	(858)	0	0	(858)	0
Change in cumulative translation adjustment, net	244	0	0	0	244
BALANCE at end of year at Mar. 31, 2018	$ 82,545	$ 18	$ 134,253	$ (52,024)	$ 298