Common Stock (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

The shares reserved for future issuance as of March 31, 2015 and December 31, 2014 consisted of the following:

(in thousands)	March 31, 2015		December 31, 2014
Options to purchase common stock		20,285		19,567
Common stock warrants		741		2,381
Conversion premium on the Notes		25,000		25,000