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Common Stock (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Activities for the Restricted Stock Issued to Employees
The activities for the restricted stock issued to employees was as follows (in thousands, except per share data):
Number of
Shares		Weighted-
Average
Grant Date
Fair Value Per Share
Unvested restricted stock as of December 31, 2023285 
Granted— $— 
Vested(47)$76.91 
Forfeited— $— 
Unvested restricted stock as of March 31, 2024238 
Schedule of Activity under the 2014 and 2020 Plans
A summary of stock option activity under the 2014 Equity Incentive Plan, 2020 Equity Incentive Plan, and 2022 Inducement Equity Incentive Plan was as follows (in millions, except share amounts which are reflected in thousands, and per share data):
Options Outstanding
Shares
subject to
Options
Outstanding		Weighted-
Average
Exercise
Price Per Share		Weighted-
Average
Remaining
Contractual
Term
(in years)		Aggregate
Intrinsic
Value
Balance as of December 31, 20239,022 $4.38 3.41$853 
Granted— $— 
Exercised(1,574)$0.89 $180 
Cancelled and forfeited— $— 
Balance as of March 31, 20247,448 $5.12 3.60$988 
Exercisable as of March 31, 20247,181 $5.15 3.63$952 
Vested and expected to vest as of March 31, 20247,448 $5.12 3.60$988 
Summary of RSU Activity
The summary of RSU activity was as follows (in millions, except share amounts which are reflected in thousands, and per share data):
Number of
Shares		Weighted-
Average
Grant Date
Fair Value Per Share		Aggregate
Intrinsic
Value
Unvested RSUs as of December 31, 202337,792 $3,645 
Granted1,108 $119.95 
Vested(5)$74.04 
Vested and settled(3,705)$77.91 
Forfeited(782)$77.47 
Unvested RSUs as of March 31, 202434,408 $4,757 
Schedule of Stock-based compensation Expense
The Company recorded stock-based compensation expense in the condensed consolidated statements of operations as follows (in millions):
Three Months Ended March 31,
20232024
Cost of revenue, exclusive of depreciation and amortization$24 $32 
Sales and marketing24 25 
Research and development98 113 
General and administrative84 82 
Total stock-based compensation expense$230 $252