STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Common Stock [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]
Balance at Dec. 31, 2012	$ 13,975	$ 156,172	$ (142,200)	$ 3	$ 0	$ 0
Balance (in shares) at Dec. 31, 2012				3,220,000	0	0
Issuance of shares of common stock in connection with a public offering (net of issuance costs of $1,025)	15,725	15,724	0	1	0	0
Issuance of shares of common stock in connection with a public offering (net of issuance costs of $1,025) (in shares)				1,081,000	0	0
Issuance of shares of common stock and warrants in connection with an October 2013 private placement (net of issuance costs of $3,426)	2,573	2,572	0	1	0	0
Issuance of shares of common stock and warrants in connection with an October 2013 private placement (net of issuance costs of $3,426) (in shares)				423,000	0	0
Warrants issued in connection with loans payable	652	652	0	0	0	0
Warrants issued in connection with loans payable (in shares)				0	0	0
Exercise of options	18	18	0		0	0
Exercise of options (in shares)	1,806			2,000	0	0
Share-based compensation expense	1,301	1,301	0	0	0	0
Share-based compensation expense (in shares)				24,000	0	0
Net loss	(25,948)	0	(25,948)	0	0	0
Balance at Dec. 31, 2013	8,296	176,439	(168,148)	5	0	0
Balance (in shares) at Dec. 31, 2013				4,750,000	0	0
Issuance of Series A convertible preferred stock and common stock in connection with the February 2014 private placement (net of issuance costs of $992)	11,458	11,457	0	0	1	0
Issuance of Series A convertible preferred stock and common stock in connection with the February 2014 private placement (net of issuance costs of $992) (in shares)				20,000	12,000	0
Issuance of warrants in connection with the February 2014 private placement	(5,585)	(5,585)	0	0	0	0
Issuance of warrants in connection with the February 2014 private placement (in shares)				0	0	0
Issuance of Series B convertible preferred stock in connection with the July 2014 private placement	1		0	0	0	1
Issuance of Series B convertible preferred stock in connection with the July 2014 private placement (in shares)				0	0	12,000
Expenses related to the issuance of Series B convertible preferred stock in connection with the July 2014 private placement	(103)	(103)
Warrants and beneficial conversion feature issued with senior secured debentures	10,353	10,353	0	0	0	0
Redemption of Series A convertible preferred stock in connection with the July 2014 private placement	(1)	0	0	0	(1)	0
Redemption of Series A convertible preferred stock in connection with the July 2014 private placement (in shares)				0	(12,000)	0
Beneficial conversion feauture related to Series B convertible preferred stock	0	(1,887)	0	0	0	1,887
Accretion of discount on Series B convertible preferred stock	0	1,887	0	0	0	(1,887)
Conversion of 0.5 shares of Series B convertible preferred stock	0	0		0	0	0
Conversion of 0.5 shares of Series B convertible preferred stock (in shares)				200,000	0	(1,000)
Conversion of $1,589 in convertible debentures	1,589	1,588	0	1	0	0
Conversion of $1,589 in convertible debentures (in shares)				620,000	0	0
Exercise of prefunded warrants	0	0	0	0	0	0
Exercise of prefunded warrants (in shares)				434,000	0	0
Issuance of shares of common stock in connection with a public offering (net of issuance costs of $1,025) (in shares)						12,300,000
Exercise of options (in shares)	0
Share-based compensation expense	413	413	0	0	0	0
Share-based compensation expense (in shares)				13,000	0	0
Net loss	(14,145)	0	(14,145)	0	0	0
Balance at Dec. 31, 2014	$ 12,276	$ 194,562	$ (182,293)	$ 6	$ 0	$ 1
Balance (in shares) at Dec. 31, 2014				6,037,000	0	11,000