Statement of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified	Junior Series A Convertible Preferred Stock	Common stock.	Additional paid-in capital	Accumulated Deficit.	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2011	$ 3,000	$ 1		$ (105,488)		$ (102,487)
Balance (in shares) at Dec. 31, 2011	3,000,000	1,451,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock			2			2
Issuance of common stock (in shares)		19,000
Issuance of Junior Series A Preferred Stock			640			640
Preferred Stock dividends			(642)	(6,421)		(7,063)
Net loss				(14,562)		(14,562)
Balance at Dec. 31, 2012	3,000	1		(126,471)		(123,470)
Balance (in shares) at Dec. 31, 2012	3,000,000	1,470,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock		21	174,310			174,331
Issuance of common stock (in shares)		21,038,000
Issuance of common stock from offering, net		9	175,546			175,555
Issuance of common stock from offering, net (in shares)		8,740,000
Issuance of common stock upon conversion of Junior Series A Preferred Stock	(3,000)					(3,000)
Issuance of common stock upon conversion of Junior Series A Preferred Stock (in shares)	(3,000,000)
Reclassification of warrant liability			2,179			2,179
Reclassification of preferred stock issuance costs			(1,804)			(1,804)
Exercise of stock options/warrants			94			94
Exercise of stock options/warrants (in shares)		165,000
Share-based compensation			2,871			2,871
Preferred Stock dividends			(457)	(5,434)		(5,891)
Net loss				(51,145)		(51,145)
Balance at Dec. 31, 2013		31	352,739	(183,050)		169,720
Balance (in shares) at Dec. 31, 2013		31,413,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock from offering, net		2	55,407			55,409
Issuance of common stock from offering, net (in shares)		1,900,000
Exercise of stock options/warrants		1	2,948			2,949
Exercise of stock options/warrants (in shares)		682,000
Share-based compensation			13,040			13,040
Excess tax benefit from share-based compensation			4,256			4,256
Net loss				(98,188)		(98,188)
Unrealized loss on available for sale securities, net of taxes					(65)	(65)
Balance at Dec. 31, 2014		$ 34	$ 428,390	$ (281,238)	$ (65)	$ 147,121
Balance (in shares) at Dec. 31, 2014		33,995,000