Net Loss per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2018

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:

	Year Ended December 31,
	2018		2017
Options to purchase common stock		2,164,101		1,034,961
Restricted common stock		153,276		276,301
Redeemable convertible preferred stock (as converted to common stock)		—		8,418,149
Warrants to purchase redeemable convertible preferred stock (as converted to common stock)		—		6,850