Net Loss per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Common Shares Excluded from the Calculation of Net Loss per Common Share Attributable to Common Stockholders

The following table sets forth the potential common shares excluded from the calculation of net loss per common share attributable to common stockholders because their inclusion would be anti-dilutive:

	At March 31,
	2016		2015
Options to purchase common stock		389,942		307,926
Common stock underlying Series A and Series A-1 convertible preferred stock		—		757,120
Warrants to purchase common stock		2,556,966		462
Total		2,946,908		1,065,508