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Stock-based Compensation (Tables)

9 Months Ended

Sep. 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		(244,153)	​	$	20.00		—	​	$	3,078
Forfeited/canceled		—	​	$	—		—	​	$	—
Balance at September 30, 2020		120,000	​	$	28.80		0.57	​	$	74
Vested and exercisable as of September 30, 2020		120,000	​	$	28.80		0.57	​	$	74

(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

​

​	​	​	​	​	​
​	​	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 September 30, 2020		1,470,051	​	$	42.04
Expected to vest after September 30, 2020		1,470,051	​	$	42.04

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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