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Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The common stock equivalents issuable upon the conversion or exercise of the following dilutive securities have been excluded from the computation of diluted net loss per share attributable to common stockholders calculation because their effect would have been anti-dilutive for the periods presented:



	DECEMBER 31,
	2017	2016	2015
Outstanding stock option grants	4,094,532	3,590,393	2,832,467
Unvested restricted stock awards	195,172	107,250	—
Total	4,289,704	3,697,643	2,832,467