Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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,
	2018		2017		2018		2017
Unvested restricted common stock		30,408		63,431		31,233		68,693
Options to purchase common stock		3,015,991		1,894,831		2,856,763		1,618,721