Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of fair value of options granted

Expected volatility	96.5	%
Expected dividend yield	—
Expected term (in years)	2.99
Risk-free interest rate	0.44	%

Schedule of stock option activity

	Number of Options			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (1)
Outstanding at December 31, 2020		496,471		$	8.63		3.9	$	—
Granted		575,565		$	1.65		4.8	$	—
Exercised		—		$	—		—	$	—
Forfeited		(3,300	)	$	—		—	$	—
Expired		—		$	—		—	$	—
Outstanding at September 30, 2021		1,068,736		$	4.73		2.1	$	—
Exercisable at September 30, 2021		519,125		$	6.95		1.9	$	—

(1) The aggregate intrinsic value in the table was calculated based on the difference between the estimated fair market value of the Company’s stock and the exercise price of the underlying options. The estimated stock values used in the calculation were $1.73 and $1.51 per share for the year ended December 31, 2020 and the nine months ended September 30, 2021, respectively.

Schedule of summarizes restricted stock unit activity

	Number  of Units			Weighted Average Grant-Date Fair Value Per Unit
Outstanding as of December 31, 2020		32,072		$	2.01
Granted		—		$	—
Vested		(31,405	)	$	1.97
Forfeited		—		$	—
Outstanding as of September 30, 2021		667		$	1.80

Schedule of stock-based compensation expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Research and development	$	1	$	2	$	2	$	7
Selling, general and administrative		213		160		548		446
Total stock-based compensation expense	$	214	$	162	$	550	$	453