Net Loss Per Share

12 Months Ended

Dec. 31, 2019

The Company has reported a net loss for the years ended December 31, 2019, 2018, and 2017. For this reason basic and diluted net loss per share are the same for all periods presented. Since the shares underlying the 8,342,128 pre-funded warrants are issuable for little or no consideration, they are considered outstanding for both basic and diluted earnings per share. The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per‑share data):



	Year Ended December 31,
	2019			2018			2017
Numerator:
Net loss attributable to common stockholders	$	(55,350	)	$	(65,336	)	$	(65,321	)
Denominator:
Weighted‑average common shares and pre-funded warrants outstanding—basic and diluted	45,548,511			22,389,286			20,425,050
Net loss per share attributable to common stockholders —basic and diluted	$	(1.22	)	$	(2.92	)	$	(3.20	)

All potential dilutive common shares have been excluded from the computation of the diluted net loss per share for all periods presented, as the effect would have been anti-dilutive. Potential dilutive common share equivalents consist of the following:



	Year Ended December 31,
	2019	2018	2017
Stock options to purchase common stock	6,796,669	4,093,979	2,657,187
Unvested restricted stock units	181,250	175,000	—
Stock warrants to purchase common stock	23,084,120	95,619	176,432
Total	30,062,039	4,364,598	2,833,619