Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss)	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
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)
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]
Foreign currency translation adjustments	(3)
Balance at the end of the period (in shares) at Sep. 30, 2018		12,071
Balance at the end of the period at Sep. 30, 2018	13,842	$ 1	128,160	(1)	(114,318)
Balance at the beginning of the period (in shares) at Mar. 31, 2018		11,931
Balance at the beginning of the period at Mar. 31, 2018	17,066	$ 1	127,656	3	(110,594)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock purchase plans (in shares)		119
Issuance of common stock under employee stock option and stock purchase plans	22	$ 22
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)		(3)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(7)		(7)
Stock-based compensation	235		235
Foreign currency translation adjustments	(4)			(4)
Net loss from continuing operations	(1,804)				(1,804)
Balance at the end of the period (in shares) at Jun. 30, 2018		12,047
Balance at the end of the period at Jun. 30, 2018	15,508	$ 1	127,906	(1)	(112,398)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock purchase plans (in shares)		34
Issuance of common stock under employee stock option and stock purchase plans	(1)	$ (1)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)		(10)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(21)		(21)
Stock-based compensation	276		276
Foreign currency translation adjustments	0
Net loss from continuing operations	(1,920)				(1,920)
Balance at the end of the period (in shares) at Sep. 30, 2018		12,071
Balance at the end of the period at Sep. 30, 2018	13,842	$ 1	128,160	(1)	(114,318)
Balance at the beginning of the period (in shares) at Dec. 31, 2018		12,091
Balance at the beginning of the period at Dec. 31, 2018	11,052	$ 1	128,367	(1)	(117,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock purchase plans (in shares)		150
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)		(50)
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(111)		(111)
Stock-based compensation	543		543
Net loss from continuing operations	(2,865)				(2,865)
Balance at the end of the period (in shares) at Mar. 31, 2019		12,191
Balance at the end of the period at Mar. 31, 2019	8,433	$ 1	128,799	(1)	(120,366)
Balance at the beginning of the period (in shares) at Dec. 31, 2018		12,091
Balance at the beginning of the period at Dec. 31, 2018	11,052	$ 1	128,367	(1)	(117,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustments	(2)
Balance at the end of the period (in shares) at Sep. 30, 2019		12,370
Balance at the end of the period at Sep. 30, 2019	5,240	$ 1	128,808	(3)	(123,566)
Balance at the beginning of the period (in shares) at Mar. 31, 2019		12,191
Balance at the beginning of the period at Mar. 31, 2019	8,433	$ 1	128,799	(1)	(120,366)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock purchase plans (in shares)		179
Issuance of common stock under employee stock option and stock purchase plans	0		0
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units (in shares)		0
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	(5)		(5)
Stock-based compensation	(20)		(20)
Foreign currency translation adjustments	(2)			(2)
Net loss from continuing operations	(2,254)				(2,254)
Balance at the end of the period (in shares) at Jun. 30, 2019		12,370
Balance at the end of the period at Jun. 30, 2019	6,152	$ 1	128,774	(3)	(122,620)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	34		34
Foreign currency translation adjustments	0
Net loss from continuing operations	(946)				(946)
Balance at the end of the period (in shares) at Sep. 30, 2019		12,370
Balance at the end of the period at Sep. 30, 2019	$ 5,240	$ 1	$ 128,808	$ (3)	$ (123,566)