Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)	Redeemable Convertible Preferred Stock Series B [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balances at Dec. 31, 2013	$ 707,000	$ 36,000	$ 362,454,000	$ (385,115,000)	$ (22,625,000)
Balances (in shares) at Dec. 31, 2013	8,859,978	3,650,711
Net income (loss)				23,109,000	23,109,000
Accretion of dividends on Series B redeemable convertible preferred stock	$ (1,285,000)		1,285,000		1,285,000
Warrants exercised		$ 1,000	1,594,000		1,595,000
Warrants exercised (in shares)		54,683
Conversion of Series B redeemable convertible preferred stock to common stock, value	$ (2,000)	$ 1,000	706,000		707,000
Conversion of Series B redeemable convertible preferred stock to common stock, shares	(188,938)	37,788
Stock-based compensation			775,000		775,000
Stock-based compensation - severance			1,161,000		1,161,000
Shares released from escrow		$ 2,000	(2,000)
Shares released from escrow (in shares)		240,000
Balances at Dec. 31, 2014	$ 1,990,000	$ 40,000	365,403,000	(362,006,000)	3,437,000
Balances (in shares) at Dec. 31, 2014	8,671,040	3,983,182
Net income (loss)				(3,724,000)	(3,724,000)
Accretion of dividends on Series B redeemable convertible preferred stock	$ (674,000)		674,000		674,000
Warrants exercised			1,072,000		1,072,000
Warrants exercised (in shares)		56,644
Amount reclassified to additional paid in capital related to amendment of warrants			5,462,000		5,462,000
Amount reclassified to Series B redeemable convertible stock to accrete to its redemption value	1,492,000		(1,492,000)		$ (1,492,000)
Exercise of common stock options (shares)		15,163			(80,000)
Net common stock issued in March 2015 financing		$ 16,000	8,250,000		$ 8,266,000
Net common stock issued in March 2015 financing (in shares)		1,575,758
Conversion of Series B redeemable convertible preferred stock to common stock, value	$ (133,000)	$ 1,000	635,000		636,000
Conversion of Series B redeemable convertible preferred stock to common stock, shares	(380,687)	76,137
Stock-based compensation			105,000		105,000
Balances at Jun. 30, 2015	$ 4,023,000	$ 57,000	$ 378,761,000	$ (365,730,000)	$ 13,088,000
Balances (in shares) at Jun. 30, 2015	8,290,353	5,706,884