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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Stock-Based Compensation

Schedule of fair value of each option grant

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​	​	​	​	​	​
​	​	September 30,			​
​		2023		2022
Expected life (years)	​	3.8 - 5.2	​	3.8 - 5.2	​
Risk-free interest rate		3.5% - 4.4%	​	2.1% - 3.7%	​
Volatility	​	69.9% - 80.0%	​	67.5% - 76.8%	​
Dividend yield		0%	​	0%	​

Schedule of stock-based compensation expense related to all of our share-based payment awards

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Three Months Ended September 30,

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Nine Months Ended September 30,

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2023

2022

2023

2022

Cost of revenues

​

$

604

​

$

690

​

$

1,655

​

$

1,868

Selling, general and administrative

​

4,904

​

​

4,194

​

13,973

​

​

11,541

Engineering and development

​

468

​

​

482

​

1,332

​

​

1,340

​

​

$

5,976

​

$

5,366

​

$

16,960

​

$

14,749

Schedule of stock option activity

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​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​
​	​	​	​	Weighted-		​	Average	​	​	​
​	​	​	​	Average		​	Remaining	​	Aggregate
​	​	Number of	​	Exercise		​	Contractual	​	Intrinsic
​		Shares		Price/Share			Term (Years)		Value (1)
Outstanding — December 31, 2022	​	7,340,521	​	$	15.10	​	—	​	​	—
Granted (weighted-average fair value of $12.03 per share)	​	394,050	​	​	21.03	​	—	​	​	—
Exercised		(407,814)		​	3.63		—	​	​	—
Forfeited	​	(61,056)	​	​	30.11	​	—	​	​	—
Outstanding — September 30, 2023		7,265,701	​	$	15.93		4.5	​	$	27,589
Vested (exercisable) — September 30, 2023		6,223,812	​	$	13.50		4.3	​	$	27,568
Expected to vest after September 30, 2023 (unexercisable)		1,041,889	​	$	30.45		6.0	​	$	21

(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, 2023, which was $13.71 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, 2022		727,984	​	$	38.32
Granted		628,625	​		20.00
Share issuance		(221,623)	​		37.67
Forfeited		(61,146)	​		31.57
Outstanding – September 30, 2023		1,073,840	​	$	28.11

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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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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