Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2017	$ 28	$ 297,250	$ 287	$ (256,190)	$ (258)	$ 41,117
Balance, shares at Dec. 31, 2017	27,790,324
Net loss				(3,419)		(3,419)
Common stock issued, net of issuance costs	$ 1	650				651
Common stock issued, net of issuance costs, shares	1,040,095
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes		81				81
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes, shares	990
Unrealized holding loss on marketable securities			(937)			(937)
Balance at Mar. 31, 2018	$ 29	$ 297,981	$ (650)	$ (259,609)	$ (258)	$ 37,493
Balance, shares at Mar. 31, 2018	28,831,409