Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of stock option activity

A summary of stock option activity for the nine months ended September 30, 2021 follows:

	Shares	Exercise Price		Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)(1)
Balance at December 31, 2020	50,000	$	28.80	0.32	$	781
Granted	—	$	—	—	$	—
Exercised	(50,000)	$	28.80	—	$	993
Forfeited/canceled	—	$	—	—	$	—
Balance at September 30, 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 the Company’s Class A common stock as of the respective date.

Summary of activities for unvested RSUs

The following table summarizes the activities for the Company’s unvested RSUs for the nine months ended September 30, 2021:

	Unvested Restricted Stock Units
	Number of Shares	Weighted-Average Grant-Date Fair Value
Unvested at December 31, 2020	1,466,060	$	42.03
Granted	597,728	$	47.64
Vested	(423,402)	$	41.91
Forfeited/canceled	(68,142)	$	49.36
Unvested at September 30, 2021	1,572,244	$	43.88
Expected to vest after September 30, 2021	1,442,144	$	44.20