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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The fair value of each stock option granted was estimated using the following assumptions:
June 28, 2021
Risk free interest rate0.47%
Expected option lives3 years
Expected volatility1.36
Estimated forfeiture rate—
Expected dividend yields—
Weighted average grant date fair value of options$2.48
Schedule of Compensation Expense
Stock-based compensation expense relating to Restricted Series D Preferred Stock is allocated as follows (in thousands):
Year Ended December 31,
20212020
Research and development
$17 $47 
Sales, general and administrative16 111 
$33 $158 
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Options Granted, Exercised, Expired and Forfeited A summary of stock options expired and forfeited under our plans and options outstanding as of, and changes made during, the years ended December 31, 2021 and 2020 is presented below:
Outstanding
Exercisable
Number of Options
Weighted Average Exercise Price
Number of Options
Weighted Average Exercise Price
Options outstanding and exercisable, December 31, 2019215,345 $12.27 215,345 $12.27 
Expired(107,845)4.92
Options outstanding and exercisable, December 31, 2020107,500 19.64 107,500 19.64 
Granted300,000 3.25 
Options outstanding and exercisable, December 31, 2021407,500 $7.57 107,500 $19.64 
Shares Outstanding and Exercisable, By Exercise Price Range
Additional information as of December 31, 2021 is as follows:

 Outstanding ExercisableExercisable
Range of priceNumber
of Options		Weighted
Average
Remaining
Contractual
Life (In Years)		Weighted
Average
Exercise
Price		Number
of Options		Weighted
Average
Exercise
Price
$0.00 – $10.00
302,500 9.43$3.30 2,500 $9.00 
$10.01 – $20.00
97,500 1.0619.32 97,500 19.32 
$20.01 – $30.00
2,500 0.4321.80 2,500 21.80 
$30.01 – $40.00
5,000 0.1930.20 5,000 30.20 
407,500 7.26$7.57 107,500 $19.64