Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common stock	Treasury stock	Additional paid-in capital	Accum other comp inc.	Accum deficit	Total
Balance at Dec. 31, 2016	$ 29	$ (12,148)	$ 374,903	$ (30)	$ (312,305)	$ 50,449
Balance, Shares at Dec. 31, 2016	2,860,367	(177,484)
Exercise of stock options, net of shares withheld for employee taxes			(1)			(1)
Exercise of stock options, net of shares withheld for employee taxes, Shares	168
Stock-based compensation			277			277
Restricted stock issued			160			160
Restricted stock issued, Shares	16,496
Common stock issued, net of shares withheld for employee taxes			272			272
Common stock issued, net of shares withheld for employee taxes, Shares	33,318
Reverse stock split fractional shares
Reverse stock split fractional shares, Shares	(15)
Foreign currency translation adjustments				10		10
Unrealized gain on investments, net of tax				17		17
Net loss					(17,851)	(17,851)
Balance at Dec. 31, 2017	$ 29	$ (12,148)	375,611	(3)	(330,156)	33,333
Balance, Shares at Dec. 31, 2017	2,910,334	(177,484)
Exercise of stock options, net of shares withheld for employee taxes			1			1
Exercise of stock options, net of shares withheld for employee taxes, Shares	125
Stock-based compensation			47			47
Restricted stock issued			69			69
Restricted stock issued, Shares	6,592
Common stock issued, net of shares withheld for employee taxes			251			251
Common stock issued, net of shares withheld for employee taxes, Shares	2,491
Purchase of treasury stock, at cost		$ (65)				(65)
Purchase of treasury stock, at cost, Shares		(8,457)
Unrealized gain on investments, net of tax				1		1
Net loss					963	963
Balance at Dec. 31, 2018	$ 29	$ (12,213)	$ 375,979	$ (2)	$ (329,193)	$ 34,600
Balance, Shares at Dec. 31, 2018	2,919,542	(185,941)