Net Loss per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Dilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share

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)		—		—