Common Stock (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

The shares reserved for future issuance as of June 30, 2014 and December 31, 2013 consisted of the following:

(in thousands)	June 30, 2014		December 31, 2013
Options to purchase common stock		21,245		20,107
Common stock warrants		2,407		2,777
Conversion premium on the Notes		25,000		25,000