Net Loss Per Share Attributable to Common Stockholders (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Weighted-Average Equity Instruments Excluded from Calculation of Diluted Net Loss Per Share

The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Series A convertible preferred stock		—		286,486		—		1,229,503
Series B convertible preferred stock		—		659,337		—		2,829,657
Unvested restricted common stock		63,431		106,055		68,693		111,345
Options to purchase common stock		1,894,831		1,031,128		1,618,721		843,975