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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Stock-Based Compensation

Schedule of fair value assumptions of stock options

​

​	​	​	​	​
​	​	September 30,
​		2022		2021
Expected life (years)	​	3.8 - 5.2	​	3.5 - 6.1
Risk-free interest rate		2.1% - 3.7%	​	0.5% - 0.9%
Volatility	​	67.5% - 78.6%	​	64.4% - 80.8%
Dividend yield		0%	​	0%

Schedule of share-based payment awards

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Three Months Ended September 30,

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Nine Months Ended September 30,

​

2022

2021

2022

2021

Cost of revenues

​

$

690

​

$

463

​

$

1,868

​

$

1,154

Selling, general and administrative

​

4,194

​

​

3,322

​

​

11,541

​

​

9,050

Engineering and development

​

482

​

​

363

​

​

1,340

​

​

959

​

​

$

5,366

​

$

4,148

​

$

14,749

​

$

11,163

Schedule of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​
​	​	​	​	Weighted-		​	Average	​	​	​
​	​	​	​	Average		​	Remaining	​	Aggregate
​	​	Number of	​	Exercise		​	Contractual	​	Intrinsic
​		Shares		Price/Share			Term (Years)		Value (1)
Outstanding — December 31, 2021		7,027,941	​	$	13.97				​
Granted (weighted-average fair value of $17.34 per share)	​	573,502	​	​	30.46	​		​	​	​
Exercised		(171,634)	​	​	9.30				​	​
Forfeited		(47,646)	​	​	45.90				​	​
Outstanding — September 30, 2022		7,382,163	​	$	15.15	​	5.2	​	$	91,272
Vested (exercisable) — September 30, 2022		5,910,748	​	$	11.06	​	4.8	​	$	86,953
Expected to vest after September 30, 2022 (unexercisable)		1,471,415	​	$	31.58	​	6.8	​	$	4,319

(1) Aggregate intrinsic value represents the difference between the exercise price of the option and the closing market price of our common stock on September 30, 2022, which was $24.36 per share.

Schedule of restricted stock unit activity

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​	​	​	​	​	​
​	​	​	​	Weighted Average
​	​	Number of Restricted	​	Fair Value per
​		Stock Units		Share
Outstanding – December 31, 2021	​	373,849	​	$	55.53
Granted		504,537	​	​	30.81
Share issuance	​	(97,062)	​	​	55.18
Forfeited		(47,849)	​	​	46.70
Outstanding – September 30, 2022		733,475	​	$	39.15

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