Net Loss per Share Attributable to Common Stockholders

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Loss per Share Attributable to Common Stockholders

10. Net Loss per Share Attributable to Common Stockholders

For purposes of the diluted net loss per share calculation, stock options, unvested restricted stock, Preferred Stock and the warrant to purchase shares of Series A Preferred Stock are considered to be common stock equivalents but have been excluded from the calculation of diluted net loss per share, as their effect would be anti-dilutive for all periods presented. Therefore, the weighted-average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same.

The following potentially dilutive common stock equivalents, presented based on amounts outstanding at each period end, were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods indicated:

	Nine Months Ended September 30,
	2019		2018
Options to purchase common stock		3,145,428		1,957,839
Restricted common stock		63,313		184,033
Warrants to purchase redeemable convertible preferred stock    (as converted to common stock)		—		—