Financing (Tables)

6 Months Ended

Jun. 30, 2014

Text Block [Abstract]

May 2013 Follow-on Underwritten Public Offering

On May 7, 2013, the Company closed a follow-on underwritten public offering, in which it sold 17,500,000 shares of common stock, together with matching warrants to purchase up to 17,500,000 shares of common stock, and pre-funded warrants to purchase up to 15,816,327 shares of common stock, together with matching warrants to purchase up to 15,816,327 shares of common stock, for aggregate gross proceeds of $16.5 million as follows:

	Combined Price to the Public (per share of common stock)		Common Stock		Pre-funded Warrants		Matching Warrants
Common stock and matching warrants sold (shares)	$	0.50		17,500,000		—		17,500,000
Pre-funded warrants & matching warrants sold (shares)	$	0.49		—		15,816,327		15,816,327
Total (shares)				17,500,000		15,816,327		33,316,327
Warrant exercise price (per share)		—		—	$	0.01	$	0.47
Term of warrant (years)		—		—		7.0		5.0