Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Schedule of Range of Warrant Prices per Share for Shares Under Warrants and the Weighted Average Contractual Life

At March 31, 2023 and December 31, 2022, the weighted average warrant exercise price per share for common stock and the weighted average contractual life was as follows:

	Number of Common Stock Warrants*	Weighted Average Exercise Price Per Share*		Weighted Average Remaining Contractual Life	Number of Warrants Exercisable*	Weighted Average Price Per Share*
Outstanding December 31, 2022	480,837	$	22.22	2.73	480,837	$	22.22
Granted	—	$	—	—	—	$	—
Exercised	—	—		—	—	—
Cancelled/expired	—	—		—	—	—
Outstanding March 31, 2023	480,837	$	22.22	2.48	480,837	$	22.22

*Adjusted for the 1-for-25 reverse stock split

Schedule of Activity Under All Stock Option Plans

Activity under all stock option plans was as follows:

	Number of Options*	Weighted Average Exercise Price per Share*		Aggregate Intrinsic Value (in Thousands)*
Outstanding December 31, 2022	175,783	$	44.76	$	—
Granted	—	—		—
Expired	(2,046)	158.55		—
Cancelled/Forfeited	—	—		—
Outstanding March 31, 2023	173,737	$	43.42	$	—
Total vested and exercisable	43,947	$	136.49	$	—

  *Adjusted for the 1-for-25 reverse stock split

Schedule of Restricted Stock Award Activity Under the Plan

Restricted common stock award activity under the plan was as follows:

	Number of Shares*	Weighted Average Fair Value*
Unvested December 31, 2022	237,966	$	18.77
Granted	—	—
Vested	(4,136)	27.19
Forfeited	(8,014)	18.39
Unvested March 31, 2023	225,816	$	18.63

*Adjusted for the 1-for-25 reverse stock split

Schedule of Assumptions Used to Estimate the Fair Value of Options at Date of Grant

The fair value of options at date of grant was estimated using the Black-Scholes option pricing model, based on the following assumptions:

	Three Months Ended March 31,
	2023	2022
Risk-free interest rate	—%	2.54%
Expected term (in years)	0.00	8.00
Dividend yield	—%	—%
Expected volatility	—%	87.49%

Schedule of Stock-Based Compensation

The following is a summary of stock-based compensation expense (in thousands):

	Three Months Ended March 31,
	2023		2022
Cost of revenues	$	14	$	(35)
Sales and marketing	136		176
Research and development	71		138
General and administrative	400		457
	$	621	$	736