Stock Award Plans and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Options Granted

See below for a summary of the stock options granted under the 2017 and 2018 plans:

	Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Life (Years)	Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2026	15,941,550	$	2.80	9.8	$	—
Granted	5,317,127	$	1.77
Forfeitures	(1,980,685)	$	5.41
Exercises	(37,500)	$	2.00
Outstanding at September 30, 2026	19,240,492	$	2.23	9.2	$	—
Exercisable at September 30, 2026	13,378,571	$	1.69	9.1	$	—

Schedule of Assumptions in Estimating Fair Values of Options Awarded

The following assumptions were used in estimating the fair values of options awarded during the nine months ended September 30, 2026:

Fair value of common stock	$1.43 - $2.35
Exercise price	$1.43 - $2.35
Expected term	5 – 7 years
Volatility	134.52% - 153.30%
Risk-free interest rate	3.51% - 4.43%
Dividend yield	—%

Schedule of Stock-Based Compensation Charges

Stock-based compensation charges for the periods indicated below (in thousands) are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Research and development	$	—	$	216	$	205	$	546
Sales and marketing	28		254		493		294
General and administrative	5,390		5,880		13,168		6,687
Total	$	5,418	$	6,350	$	13,866	$	7,527