Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Stock-based Compensation

Summary of stock option activity

				Remaining	Aggregate
		Exercise		Contractual Term	Intrinsic Value
	Shares	Price		(in years)	(in thousands)(1)
Balance at December 31, 2019	364,153	$	22.90	0.75	$	8,965
Granted	—	$	—	—	$	—
Exercised	(242,801)	$	20.00		$	3,069
Forfeited/canceled	—	$	—	—	$	—
Balance at June 30, 2020	121,352	$	28.70	0.81	$	71
Vested and exercisable as of June 30, 2020	121,352	$	28.70	0.81	$	71

(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 additional information regarding exercisable and vested stock options

	Stock Options Exercisable
	and Vested
		Weighted-
		Average
	Number of	Remaining Life
Range of exercise prices	Shares	(in years)
$20.00	1,352	0.11
$28.80	120,000	0.82
$20.00 - $28.80	121,352	0.81

Summary of activities for unvested RSUs

	Unvested Restricted Stock Units
		Weighted-Average
	Number of	Grant-Date
	Shares	Fair Value
Unvested at December 31, 2019	1,254,904	$	43.62
Granted	670,621	$	42.20
Vested	(406,067)	$	46.96
Forfeited/canceled	(49,407)	$	43.97
Unvested at June 30, 2020	1,470,051	$	42.04
Expected to vest after June 30, 2020	1,505,285	$	42.01