Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of Company's Basic and Diluted Net Loss Per Share

The following table sets forth the computation of the Company’s basic and diluted net loss per share for the periods presented (in thousands, except share and per share data):

	Year Ended December 31,
	2018			2017			2016
Net loss attributable to common stockholders, basic and diluted	$	(79,124	)	$	(72,176	)	$	(50,636	)
Weighted-average common shares used in    computing net loss per share, basic and diluted		81,123,140			58,457,868			40,068,307
Net loss per share, basic and diluted	$	(0.98	)	$	(1.23	)	$	(1.26	)

Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

Since the Company was in a loss position for all periods presented, diluted net loss per common share is the same as basic net loss per common share for all periods presented, because the inclusion of any potential common shares outstanding would have an anti-dilutive effect. The following weighted-average common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented, because including them would have had an anti-dilutive effect:

	Year Ended December 31,
	2018		2017		2016
Convertible preferred stock (if converted)		369,934		—		—
Options to purchase common stock		10,486,468		7,914,067		6,181,015
Common stock warrant		4,464,965		3,345,674		804,248
Restricted stock units		903,163		108,107		33,835