Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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 June 30,
	2024		2023
Selling and marketing	$	13	$	56
General and administrative		150		296
	$	163	$	352

	Six Months Ended June 30,
	2024			2023
Selling and marketing*	$	(24	)	$	578
General and administrative		299			99
	$	275		$	677

*Selling and marketing expense was negative during the six months ended June 30, 2024 due to the forfeiture of awards during the period.

Stock Option Activity

The following table summarizes stock option activity for the six months ended June 30, 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		772,864		$	11.07
Granted		10,000			5.35
Forfeited and expired		(252,514	)		15.38
Outstanding at June 30, 2024		530,350		$	8.90		8.5
Exercisable at June 30, 2024		142,191		$	15.49		6.6
Vested and expected to vest at June 30, 2024		530,350		$	8.90		8.5

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

For the six months ended June 30, 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		2,265		$	10.30
Vested		(1,414	)		10.30
Unvested at June 30, 2024		851		$	10.30