Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands		Total	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2013		$ 105,023	$ 49	[1]	$ 203,238	$ (98,264)
Balance, Shares at Dec. 31, 2013	[1]		48,842
Stock-based compensation		1,202			1,202
Exercise of stock options and warrants		24			24
Exercise of stock options and warrants, Shares	[1]		23
Issuance of common stock, net of issuance costs of $3,934		52,506	14	[1]	52,492
Issuance of common stock, net of issuance costs of $3,934, Shares	[1]		14,110
Net loss		(18,066)				(18,066)
Balance at Jun. 30, 2014		$ 140,689	$ 63	[1]	$ 256,956	$ (116,330)
Balance, Shares at Jun. 30, 2014	[1]		62,975

[1] Adjusted for 1:5 reverse stock split on March 31, 2014.