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Net Loss per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Basic and Diluted Net Loss per Share Attributable to Common Stockholders
Basic and diluted net loss per share attributable to common stockholders for the years ended December 31, 2020, 2019 and 2018 are calculated as follows (in thousands, except share and per share data):

Years Ended December 31,
202020192018
Numerator:
Net loss
$(747,064)$(514,021)$(384,734)
Premium paid on repurchase of redeemable convertible preferred stock
— — (4,127)
Cumulative dividends on redeemable convertible preferred stock
— — (12,996)
Net loss attributable to common stockholders
$(747,064)$(514,021)$(401,857)
Denominator:
Weighted average common shares used in net loss per share attributable to common stockholders, basic and diluted
381,333,059 330,802,136 81,114,183 
Net loss per share attributable to common stockholders, basic and diluted
$(1.96)$(1.55)$(4.95)
Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share
The following common stock equivalents, presented based on amounts outstanding as of December 31, 2020, 2019 and 2018 were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods indicated because their inclusion would have been anti-dilutive:
December 31,
202020192018
Stock options
34,057,533 45,536,915 50,821,132 
Restricted common stock
— — 198,597 
Restricted common stock units
2,192,960 1,177,249 458,715 
36,250,493 46,714,164 51,478,444