Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Balance at the beginning of the period (in shares) at Dec. 31, 2017		11,869
Balance at the beginning of the period at Dec. 31, 2017	$ 19,292	$ 1	$ 127,493	$ 2	$ (108,204)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock purchase plans (in shares)		74
Issuance of common stock under employee stock option and stock purchase plans	0
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)		(12)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(32)		(32)
Stock-based compensation	195		195
Stock-based compensation reversal	(270)
Foreign currency translation adjustments	1			1
Net loss from continuing operations	(2,390)				(2,390)
Balance at the end of the period (in shares) at Mar. 31, 2018		11,931
Balance at the end of the period at Mar. 31, 2018	$ 17,066	$ 1	$ 127,656	$ 3	$ (110,594)