Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Stock-Based Compensation [Abstract]

Share-based Compensation Expense

The Company recorded share‑based compensation expense (for all awards and modifications, if any) in the accompanying condensed consolidated statements of operations as follows:

	Three Months Ended March 31,
	2024			2023
Selling and marketing*		(37	)		43
General and administrative		149			282
	$	112		$	325

*Selling and marketing expense was negative during the three months ended March 31, 2024 due to the forfeiture of awards during the period.

Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2024:

	Number of Shares Under Option Plan			Weighted- Average Exercise Price per Option		Weighted- Average Remaining Contractual Term (in years)
Outstanding at January 1, 2024		7,728,721		$	1.11
Granted		100,000			0.54
Forfeited and expired		(2,437,652	)		1.55
Outstanding at March 31, 2024		5,391,069		$	0.89		8.7
Exercisable at March 31, 2024		1,231,465		$	1.70		6.1
Vested and expected to vest at March 31, 2024		5,391,069		$	0.89		8.7

Weighted Average Assumption Used for Grant Date Fair Value of Option Grants

For the three months ended March 31, 2024, the grant date fair value of all option grants was estimated at the time of grant using the Black-Scholes option-pricing model using the following weighted average assumptions:

Expected volatility	77.0	%
Risk‑free rate	4.1	%
Expected term (in years)	6.3
Dividend rate	0.00	%

Summary of Activity in Restricted Stock Units

Restricted stock units have been issued to certain board members. Activity in restricted stock units is summarized in the following table:

	Number of Units			Weighted- Average Grant Date Fair Value
Unvested at January 1, 2024		22,654		$	1.03
Vested		(5,663	)		1.03
Unvested at March 31, 2024		16,991		$	1.03