Net Loss per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 2019

Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
	(In thousands, except share and per share data)						(In thousands, except share and per share data)
Numerator—basic and diluted:
Net loss	$	(12,829	)	$	(17,338	)	$	(42,047	)	$	(55,124	)
Net loss attributable to common stockholders—basic and diluted	$	(12,829	)	$	(17,338	)	$	(42,047	)	$	(55,124	)
Net loss per share attributable to common stockholders—basic and diluted	$	(0.41	)	$	(0.68	)	$	(1.40	)	$	(2.21	)
Denominator—basic and diluted:
Weighted-average number of common shares used to compute net loss per share attributable to common stockholders—basic and diluted		31,630,639			25,471,587			30,103,338			24,888,738

Potential Dilutive Securities Excluded from Computation of Diluted Net Loss per Common Share

The following potentially dilutive securities have been excluded from the computation of diluted weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares):

	September 30,
	2019		2018
Options to purchase common stock		6,053,654		4,272,646
Warrants to purchase common stock		4,595,039		—
Employee Stock Purchase Plan		15,223		29,736