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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Stock-Based Compensation

Schedule of fair value assumptions of stock options

​

​	​	​	​	​
​	​	March 31,
​		2023		2022
Expected life (years)	​	4.2 - 5.2	​	4.2 - 5.2
Risk-free interest rate		3.5% - 3.6%	​	2.1% - 2.3%
Volatility	​	73.0%	​	72.8% - 76.8%
Dividend yield		0%	​	0%

​

Schedule of share-based payment awards

​

​	​	​	​	​	​	​
​	​	Three Months Ended March 31,
​		2023			2022
Cost of revenues	​	$	475	​	$	467
Selling, general and administrative	​	​	4,304	​	​	3,291
Engineering and development	​	​	405	​	​	367
​	​	$	5,184	​	$	4,125

​

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, 2022		7,340,521	​	$	15.10		—		​	—
Granted (weighted-average fair value of $12.65 per share)	​	164,121	​	​	22.97	​	—	​	​	—
Exercised		(10,538)	​	​	8.71		—		​	—
Forfeited		(9,780)	​	​	38.81		—		​	—
Outstanding — March 31, 2023		7,484,324	​	$	15.25	​	4.8	​	$	88,714
Vested (exercisable) — March 31, 2023		6,237,688	​	$	12.02	​	4.4	​	$	85,807
Expected to vest after March 31, 2023 (unexercisable)		1,246,636	​	$	31.38	​	6.4	​	$	2,907

(1) Aggregate intrinsic value represents the difference between the exercise price of the option and the closing market price of our common stock on March 31, 2023, which was $24.00 per share.

Schedule of restricted stock unit activity

​

​	​	​	​	​	​
​	​	​	​	Weighted Average
​	​	Number of Restricted	​	Fair Value per
​		Stock Units		Share
Outstanding – December 31, 2022	​	727,984	​	$	38.32
Granted		104,923	​	​	21.62
Share issuance	​	(156,588)	​	​	41.52
Forfeited		(11,209)	​	​	36.01
Outstanding – March 31, 2023		665,110	​	$	34.96

​

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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 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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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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