Common Stock (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Reserved for Future Issuance

The Company has reserved the following shares of stock:

	As of December 31,
	2015	2014
Unvested restricted stock	41,657	125,027
Restricted stock units	150,932	—
Options to purchase common stock	2,319,772	1,904,107
Warrants to purchase common stock	926,840	899,340
Employee stock purchase plan	157,480	—
	3,596,681	2,928,474