Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted net loss per share attributable to common stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders during the years ended December 31, 2019, 2018, and 2017 (in thousands, except per share data):

	Year Ended December 31,
	2019			2018			2017
Net loss	$	(54,890	)	$	(28,321	)	$	(32,849	)
Weighted-average common shares outstanding	105,805			102,149			94,865
Net loss per share — basic and diluted	$	(0.52	)	$	(0.28	)	$	(0.35	)

Schedule of anti-dilutive shares excluded from the calculation of diluted net loss per share attributable to common stockholders

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share attributable to common stockholders at December 31, 2019, 2018, and 2017 (in thousands):

	December 31,
	2019	2018	2017
Options to purchase common stock	10,626	14,115	16,714
Common stock warrants	1,459	1,459	1,459
Unvested restricted stock units	5,891	5,376	4,284
Total shares excluded from net loss per share attributable to common stockholders	17,976	20,950	22,457