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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2025

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Schedule of stock-based compensation included in its condensed consolidated statements of operations and comprehensive income (loss)

​

​	​	​	​	​	​
​	Years Ended December 31,
(in thousands)	2025		​ ​ ​	2024
Research and development	$	3,037	​	$	8,021
General and administrative		7,595	​	​	11,896
Cost of revenue		339	​	​	18
Total	$	10,971	​	$	19,935

Schedule of share-based compensation expense by award type

​

​	​	​	​	​	​
​	Years Ended December 31,
(in thousands)	2025		​ ​ ​	2024
RSUs	$	8,359	​	$	12,733
PSUs	​	1,380	​	​	2,885
RSAs	​	1,199	​	​	1,950
Stock options	​	33	​	​	370
Earn-Out Restricted Shares	​	—	​	​	1,997
Total	$	10,971	​	$	19,935

Summary of RSU activity

​

​	​	​	​	​	​
​	​	Number of Shares	​	Weighted Average Fair Value
Outstanding at December 31, 2023	​	6,359,474	​	$	3.71
Granted	​	11,729,289	​	$	1.32
Vested	​	(2,413,455)	​	$	4.14
Forfeited and canceled	​	(2,392,385)	​	$	1.95
Outstanding at December 31, 2024	​	13,282,923	​	$	1.83
Granted	​	9,029,793	​	$	0.75
Gross vested units	​	(5,209,010)	​	$	2.40
Forfeited and canceled	​	(3,219,825)	​	$	1.31
Outstanding at December 31, 2025	​	13,883,881	​	$	1.03

Summary of fair value assumptions for performance stock units

​

​	​	​
​	​ ​ ​	2024
Expected term (in years)	​	3.0
Risk free rate	​	4.06%
Expected volatility	​	90.0%
Expected dividends	​	0%
Stock price	$	1.36

Summary of PSU activity

​

​	​	​	​	​	​
​	​	Number of Shares	​	Weighted Average Fair Value
Outstanding at December 31, 2023	​	3,364,810	​	$	3.60
Granted	​	3,637,556	​	$	0.42
Vested	​	—	​	$	—
Forfeited and canceled	​	(1,029,316)	​	$	6.96
Outstanding at December 31, 2024	​	5,973,050	​	$	1.34
Granted	​	264,469	​	$	2.32
Vested	​	—	​	$	—
Forfeited and canceled	​	(274,365)	​	$	1.31
Outstanding at December 31, 2025	​	5,963,154	​	$	1.39

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​	​
​	​	Number of Options	​	​	Weighted Average Exercise Price	​	​	Weighted Average Remaining Contractual Term (in years)	​	​	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2023	​	13,619,793	​	$	0.17	​	​	6.8	​	$	22.7
Granted	​	—	​	$	—	​	​	​	​	​	​
Exercised	​	(6,507,475)	​	$	0.16	​	​	​	​	$	4.0
Forfeited and canceled	​	(1,049,208)	​	$	0.19	​	​	​	​	​	​
Outstanding at December 31, 2024	​	6,063,110	​	$	0.19	​	​	5.5	​	$	12.2
Granted	​	—	​	$	—	​	​	​	​	​	​
Exercised	​	(614,255)	​	$	0.12	​	​	​	​	$	0.9
Forfeited and canceled	​	(17,130)	​	$	0.39	​	​	​	​	​	​
Outstanding at December 31, 2025	​	5,431,725	​	$	0.19	​	​	4.7	​	$	8.8
Vested, December 31, 2025	​	5,431,725	​	$	0.19	​	​	4.7	​	$	8.8
Vested or expected to vest, December 31, 2025	​	5,431,725	​	$	0.19	​	​	4.7	​	$	8.8

Restricted Stock

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of restricted share activity

​

​	​	​	​	​	​
​	​	Number of Shares	​	Weighted Average Fair Value
Outstanding at December 31, 2023	​	649,567	​	$	5.05
Granted	​	—	​	$	-
Vested	​	(386,964)	​	$	5.05
Forfeited and canceled	​	(7,145)	​	$	5.07
Outstanding at December 31, 2024	​	255,458	​	$	5.04
Granted	​	—	​	$	—
Vested	​	(253,358)	​	$	5.04
Forfeited and canceled	​	(2,100)	​	$	5.30
Outstanding at December 31, 2025	​	—	​	$	—

Earn-out Shares, Earn-out Restricted Shares

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of restricted share activity

​

​	​	​	​	​	​
​	​	Number of Shares	​	Weighted Average Fair Value
Outstanding at December 31, 2023	​	1,619,998	​	$	6.53
Granted/vested	​	—	​	$	—
Forfeited and canceled	​	(854,008)	​	$	6.53
Outstanding at December 31, 2024	​	765,990	​	$	6.53
Granted/vested	​	—	​	$	—
Forfeited and canceled	​	(23,710)	​	$	6.53
Outstanding at December 31, 2025	​	742,280	​	$	6.53

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