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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Stock-based Compensation

Summary of performance share units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding at December 31, 2020	​	283,223	​	$	24.26
Granted	​	213,180	​	​	35.12
Vested	​	(60,990)	​	​	22.45
Forfeited	​	—	​	​	—
Performance adjustment	​	(12,609)	​	​	21.80
Outstanding at March 31, 2021	​	422,804	​	$	30.07

Summary of restricted stock units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding at December 31, 2020	​	1,242,387	​	$	19.42
Granted	​	1,163,664	​	​	24.43
Vested	​	(352,548)	​	​	19.42
Forfeited	​	(14,968)	​	​	21.35
Outstanding at March 31, 2021	​	2,038,535	​	$	22.27

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted-		​	​
​	​	​		​	Weighted-		Average	​	​	​
​	​	​		​	Average		Remaining	​	​	Aggregate
​	​	​	​	​	Exercise Price		Contractual	​	​	Intrinsic
​		Shares		​	per Share		Term (in years)		​	Value
Outstanding at December 31, 2020		3,860,481	​	$	17.78		7.2	​	$	13,011
Granted		63,000	​	​	19.97	​	​	​	​	​
Exercised		(289,164)	​	​	14.18	​	​	​	​	​
Cancelled		(25,491)	​	​	19.30	​	​	​	​	​
Outstanding at March 31, 2021		3,608,826	​	$	18.09		7.0	​	$	20,895
Exercisable at March 31, 2021		2,353,069	​	$	17.57		6.3	​	$	14,949

Schedule of fair value assumption using Black-Scholes option-pricing model

​

​	​	​	​	​	​
​	Three months ended March 31,
​	2021		​	2020
Risk-free interest rate	0.5	%	​	1.5	%
Volatility	68.3	%	​	65.5	%
Expected term (years)	6.0	​	​	6.1	​
Expected dividend yield	—	%	​	—	%

Summary of stock-based compensation

​

​	​	​	​	​	​
​	Three months ended March 31,
​	2021		​	2020
Research and development	$	1,217		$	770
Selling, general and administrative		5,662	​		4,181
Total stock-based compensation expense	$	6,879	​	$	4,951

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