Net Loss per Share Attributable to Common Stockholders

12 Months Ended

Dec. 31, 2018

Net Loss per Share Attributable to Common Stockholders

13. 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:


	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