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Stock-Based Compensation (Tables)
12 Months Ended
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Weighted-average assumptions of fair value of employee stock options
          
   Year Ended March 31, 
   2022   2021 
Fair value of the Company’s common stock on date of grant  $4.60   $8.03 
Expected term   6.00 yrs    6.00 yrs 
Risk-free interest rate   1.60%    0.5800% 
Dividend yield   0.00%    0.00% 
Volatility   123.27%    80.7% 
Fair value of options granted  $4.03   $5.48 
Employee stock-based compensation expense
          
   Year Ended March 31, 
   2022   2021 
Cost of revenues  $   $(27,000)
Research and development       26,000 
Selling, general and administrative   382,000    372,000 
Total stock-based compensation  $382,000   $371,000 
Schedule of stock-based awards outstanding by plan
               
       Unvested     
Plan  Stock Options   Restricted Stock   Total 
2006 Plan   2,787        2,787 
2011 Plan   111,949        111,949 
2016 Plan   221,497        221,497 
2021 Plan   130,001        130,001 
    466,234        466,234 
Stock-based awards available for grant as of March 31, 2022             982,105 
Schedule of option activity
                    
   Number of
Shares
   Weighted-
Average
Exercise Price
   Weighted-
Average
Contractual Term
   Aggregate
Intrinsic
Value
 
Outstanding at April 1, 2021   267,569   $25.16           
Options granted   272,958    4.60           
Options exercised   (44,042)   4.38           
Options forfeited   (5,250)   6.89           
Options expired   (25,001)   84.83           
Outstanding at March 31, 2022   466,234   $12.09    8.89   $0 
Exercisable at March 31, 2022   115,144   $32.56    6.85   $0 
Schedule of unvested restricted stock activity
          
  

Number of

Shares

  

Weighted

Average Award

Date Fair Value

per Share

 
Unvested restricted stock awards outstanding at April 1, 2021   833   $13.68 
Restricted stock awards granted   1,596    3.05 
Restricted stock awards vested   (2,429)   6.70 
Unvested restricted stock awards outstanding at March 31, 2022      $