Common Stock (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

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

(in thousands)	December 31, 2015		December 31, 2014
Common stock warrants		—		2,381
Outstanding options to purchase common stock		19,211		19,567
Shares available for future issuance under 2011 Stock Incentive Plan		2,462		1,983
Conversion of the Convertible Notes		25,000		25,000