Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Weighted Average Grant Fair Value of Stock Options Using Black-Scholes Option-Pricing Model

The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted during the six months ended June 30, 2025 and 2024:

	Six Months Ended June 30, 2025			Six Months Ended June 30, 2024
Risk-free interest rate		4.0	%		4.9	%
Expected term (in years)		6.0			5.1
Expected volatility		97.6 — 108.6	%		110.3	%
Expected dividend yield		0	%		0	%

Schedule of Stock Option Activity

The following table summarizes option activity with service conditions under the 2021 Plan and the 2017 Plan:

	Options			Weighted Average Exercise Price		Weighted Average Contract Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2025		3,961,525		$	27.27		6.4		—
Granted		216,336			1.89		—		—
Exercised		—			—		—		—
Forfeited		(28,269	)		11.88		—		—
Outstanding at June 30, 2025*		4,149,592		$	26.05		6.0	$	27,653
Exercisable at June 30, 2025		2,714,917		$	37.24		4.4	$	—

* Options outstanding at June 30, 2025, under the 2021 Plan and 2017 Plan were 2,712,474 and 1,437,118, respectively. Options outstanding at June 30, 2025 under the 2021 Plan include 45,000 awards with performance conditions (see below).

Schedule of Warrants Purchase Agreement

Tranche	Shares		Exercise Price		Vesting Conditions
1		600,000	$	3.00	50,000 warrants vest monthly from Feb 1, 2025, with the first 50,000 warrants vesting immediately upon execution.
2		200,000	$	5.00	Vest upon the closing of a specified transaction.
3		200,000	$	6.00	Vest upon the closing of the same transaction.
4		500,000	$	12.00	Vest ratably over 12 months from May 19, 2025.
		1,500,000

Schedule of Activity Related to RSU Stock-Based Payment Awards

The following table summarizes activity related to RSU stock-based payment awards under the 2021 Plan:

	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding at January 1, 2025		659,439		$	9.29
Granted		78,802		$	2.17
Released		(154,167	)	$	15.28
Forfeited/Expired		(25,544	)	$	11.96
Outstanding at June 30, 2025		558,530		$	6.50

Schedule of Stock-based Compensation Expense

The Company recorded stock-based compensation expense in the following expense categories of its condensed consolidated statements of operations and comprehensive loss:

	Three Months Ended June 30,				Six Months Ended June 30,
	2025		2024		2025		2024
Cost of revenues	$	76	$	89	$	139	$	195
Research and development		197		345		386		721
Selling, general and administrative		2,175		2,556		4,560		5,040
	$	2,448	$	2,990	$	5,085	$	5,956