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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of activities for unvested RSUs The following table summarizes the activities for our unvested RSUs for the year ended December 31, 2021:
Unvested Restricted Stock Units
Number of SharesWeighted‑
Average
Grant‑Date
Fair Value
Unvested at December 31, 20201,466,060 $42.03 
Granted597,728 $47.64 
Vested(423,402)$41.91 
Forfeited/canceled(68,971)$49.21 
Unvested at December 31, 20211,571,415 $43.88 
Expected to vest after December 31, 2021
1,547,915 $44.45 
Summary of stock option activity
A summary of stock option activity in accordance with the Company’s stock option plan for the year ended December 31, 2021 follows:

SharesExercise
Price		Remaining
Contractual Term
(in years)
Aggregate
Intrinsic Value
(in thousands)(1)
Balance at December 31, 2018
2,620,295 $20.40 1.4925,697 
Granted
— — — — 
Exercised
(2,256,142)$20.00 — 46,358 
Forfeited/canceled
— — — — 
Balance at December 31, 2019
364,153 $22.90 0.758,965 
Granted
— — — — 
Exercised
(314,153)$21.96 — 3,972 
Forfeited/canceled
— — — — 
Balance at December 31, 2020
50,000 $28.80 0.32781 
Granted
— — — — 
Exercised
(50,000)$28.80 — 993 
Forfeited/canceled
— — — — 
Balance at December 31, 2021
— $— 0.00— 
(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of our Class A common stock as of the respective date.