CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance, Shares at Dec. 31, 2013		12	4,723	0
Beginning balance at Dec. 31, 2013	$ 3,894	$ 38,389	$ 253,270	$ 0	$ 0	$ (287,765)
Increase (Decrease) in Shareholders' Equity
Net loss	(19,920)					(19,920)
Compensation expense related to stock options granted	839		$ 839
Exercise of stock purchase warrants (in shares)			408
Exercise of stock purchase warrants	2,490		$ 2,490
Issuance of common stock, net of issuance costs of [ ] and $3,167 for 2015 and 2014, respectively (in shares)			18,655
Issuance of common stock, net of issuance costs of [ ] and $3,167 for 2015 and 2014, respectively	48,409		$ 48,409
Shares issued under the Employee Stock Purchase Plan	(71)				(71)
Ending balance, Shares at Dec. 31, 2014		12	23,786	0
Ending balance at Dec. 31, 2014	35,641	$ 38,389	$ 305,008	$ 0	(71)	(307,685)
Increase (Decrease) in Shareholders' Equity
Net loss	(16,340)
Common stock exchanged for preferred stock and held in treasury shares, Shares		1		(1,250)
Common stock exchanged for preferred stock and held in treasury shares		$ 3,150		$ (3,150)
Compensation expense related to stock options granted	2,747		$ 2,747
Exercise of stock purchase warrants (in shares)			3
Exercise of stock purchase warrants	11		$ 11
Shares issued under the Employee Stock Purchase Plan	71				71
Ending balance, Shares at Dec. 31, 2015		13	23,789	(1,250)
Ending balance at Dec. 31, 2015	$ 22,130	$ 41,539	$ 307,766	$ (3,150)	$ 0	$ (324,025)