Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

We calculated basic and diluted net loss per share attributable to common stockholders as follows (in thousands, except per share amounts):

	Year Ended December 31,
	2020				2019				2018
	Class A		Class B		Class A		Class B		Common
Numerator:
Net loss attributable to common stockholders	$	(96,499)	$	(31,824)	$	(459,412)	$	(901,959)	$	(62,974)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	448,392		147,872		141,894		278,579		127,091
Net loss per share attributable to common stockholders, basic and diluted	$	(0.22)	$	(0.22)	$	(3.24)	$	(3.24)	$	(0.50)

Weighted-Average Anti-Dilutive Shares of Common Stock Excluded from the Calculation of Diluted Net Loss Per Share

Basic net loss per share is the same as diluted net loss per share because we reported net losses for all periods presented. We excluded the following weighted-average potential shares of common stock from our calculation of diluted net loss per share attributable to common stockholders because these would be anti-dilutive (in thousands):

	Year Ended December 31,
	2020	2019	2018
Redeemable convertible preferred stock	—	95,469	308,373
Outstanding stock options	40,067	72,999	76,911
Unvested restricted stock units and restricted stock awards	63,603	69,800	68,795
Redeemable convertible preferred stock warrants	—	77	158
Common stock warrants	—	—	96
Total	103,670	238,345	454,333