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Employee Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Common Stock Reserved for Future Issuance
Shares of common stock reserved for future issuance was as follows:
December 31,20212020
Available for future RSU, PBRSU and stock option grants15,172,055 12,552,761 
Unvested RSUs, PBRSUs and stock options outstanding13,029,414 14,631,526 
Available for ESPP5,161,860 4,134,033 
Total reserved for future issuance33,363,329 31,318,320 
Total Stock-based Compensation Expense
Stock-based compensation expense was as follows for the periods presented:
Year Ended December 31,202120202019
RSUs and PBRSUs$66,552 $60,745 $70,772 
Stock options599 788 2,383 
ESPP (1)
— — 484 
Total stock-based compensation expense$67,151 $61,533 $73,639 
(1)    Purchases through the Company’s employee stock purchase plan (ESPP) were suspended effective upon the completion of the offering period on May 10, 2019.
Schedule of RSU Activity
The following table summarizes the activities for the Company’s RSUs:
Number
of Units		Weighted-
Average
Grant Date
Fair Value
Unvested at December 31, 202011,395,112 $11.26 
Granted5,792,679 $14.39 
Vested(5,033,976)$11.98 
Forfeited/expired(2,450,064)$12.58 
Unvested at December 31, 20219,703,751 $12.44 
Schedule of PBRSU Activity
The following table summarizes the activities for the Company’s PBRSUs:
Number
of Units		Weighted-
Average
Grant Date
Fair Value
Unvested at December 31, 20201,441,311 $5.31 
Granted568,285 $22.54 
Vested(79,604)$22.59 
Forfeited/expired(158,123)$12.41 
Unvested at December 31, 20211,771,869 $9.72 
Schedule of Options Activity
The following table summarizes the activities for the Company’s stock options:
Number of
Options		Weighted-Average
Exercise
Price Per
Share		Weighted-Average
Remaining
Contractual Life (in years)
Aggregate
Intrinsic 
Value (1)
(in thousands)
Outstanding at December 31, 20201,795,116 $29.99 
Granted188,626 $5.32 
Exercised
(264,826)$9.22 
Forfeited/Expired
(165,109)$15.12 
Outstanding at December 31, 20211,553,807 $32.12 3.06$6,913 
Exercisable at December 31, 20211,511,469 $32.87 2.96$6,115 
(1)    The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company’s closing stock price of $24.18 as reported on the New York Stock Exchange on December 31, 2021.