Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Calculation of Basic and Diluted Net Loss Per Share

The table presents the calculation of basic and diluted net loss per share as follows (in thousands, except per share data):

	Years Ended December 31,
	2018			2017			2016
Numerator:
Net loss allocable to common stockholders	$	(8,857	)	$	(63,509	)	$	(42,758	)
Denominator:
Weighted-average shares used in computing net loss per share, basic and diluted		104,618			28,308			4,746
Net loss per share, basic and diluted	$	(0.08	)	$	(2.24	)	$	(9.01	)

Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss Per Share

The potential common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented are as follows (in thousands):

	Years Ended December 31,
	2018		2017		2016
Equity awards to purchase common stock		20,057		26,608		22,335
Unvested shares of common stock issued upon early exercise of stock options and business acquisition		70		57		3
Warrants to purchase common stock		—		184		375
Warrants to purchase convertible preferred stock		—		—		1,817
Convertible preferred stock		—		—		80,844
Total		20,127		26,849		105,374