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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2025

Stock-Based Compensation

Schedule of stock-based compensation expense recognized for employees and non-employees

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Three Months Ended

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Nine Months Ended

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September 30,

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September 30,

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By Expense Category:

2025

2024

2025

2024

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Cost of service revenue

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$

123

​

$

45

​

$

330

​

$

166

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Research and development

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​

384

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​

839

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​

1,011

​

​

2,676

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Selling, general and administrative

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7,391

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3,997

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20,925

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10,935

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Total stock-based compensation expense

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$

7,898

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$

4,881

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$

22,266

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$

13,777

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Schedule of unamortized compensation expense and weighted average remaining recognition period

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​	​	​	​	​	​
​	​	As of September 30, 2025
​	​	​	​	​	Weighted
​	​	​	​	​	Average
​	​	​	​	​	Remaining
​	​	​	​	​	Recognition
​		Unamortized			Period
​	​	Expense		​	(Years)
Stock options	​	$	3,665		0.9
Restricted and performance stock units	​	$	43,147	​	2.4

Schedule of assumptions used for estimating the fair value of stock options

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​	​	​
​	​	Nine Months Ended
​	​	September 30,
​		2024
Expected dividend yield	​	—
Risk-free interest rate		3.98%
Expected volatility		90%
Expected life (years)		6.1

Schedule of stock option activity

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​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted		​	​
​	​	​	​	Weighted		​	Average	​	​	​
​	​	​	​	Average		​	Contractual	​	Aggregate
​	​	Number of	​	Exercise		​	Term	​	Intrinsic
​	​	Shares	​	Price		​	(in years)	​	Value
Outstanding as of December 31, 2024		9,009,005	​	$	4.76				​
Granted		—	​	​	—				​
Exercised		(461,669)	​	​	4.41				​
Cancelled		(10,117)	​	​	5.72				​
Outstanding as of September 30, 2025		8,537,219	​	$	4.78		6.1	​	$	153,322
Exercisable as of September 30, 2025		7,665,123	​	$	4.65		6.0	​	$	138,633
Vested and expected to vest as of September 30, 2025		8,505,342	​	$	4.77		6.1	​	$	152,808

Schedule of unvested RSU and PSU activity

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​	​	​	​	​	​
​	​	​	​	Weighted
​	​	​	​	Average
​	​	Number of	​	Grant-Date
​	​	Shares	​	Fair Value
Unvested as of December 31, 2024		2,948,049	​	$	10.82
Granted		2,995,662	​		12.65
Vested		(1,180,672)	​		10.89
Forfeited		(101,367)	​		12.38
Unvested as of September 30, 2025		4,661,672	​	$	11.94

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Employee Stock Purchase Plan

Stock-Based Compensation

Schedule of assumptions used for estimating the fair value of stock options

​

​	​	​	​	​
​	​	Nine Months Ended
​	​	September 30,
​		2025		2024
Expected dividend yield	​	—	​	—
Risk-free interest rate	​	3.99% - 4.31%	​	4.80% - 5.27%
Expected volatility	​	44% - 74%	​	62% - 72%
Expected life (years)	​	0.50	​	0.50

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- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement.

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