Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.22.0.1
Commitments and Contingencies (Narrative) (Details)
 12 Months Ended
Sep. 15, 2021
USD ($)
$ / shares
shares
Oct. 29, 2020
USD ($)
item
Dec. 31, 2021
USD ($)
item
shares
Dec. 31, 2020
USD ($)
shares
Aug. 28, 2020
USD ($)
Commitments and Contingencies [Line Items]          
(Income) expense for long-term compensation plan     $ 115,000 $ 66,000  
Accrual for long-term compensation plans     0 230,000  
Award payouts, cash     344,000 0  
Private placement investment $ 32,000,000.0        
Warrants purchase period 5 years        
Additional common shares available to purchase during warrant period $ 32,000,000.0        
Preferred stock, par value      
Common stock, shares outstanding | shares     9,720,627 9,321,927  
Term of company prohibited from conducting new equity offering 30 days        
Number of lawsuits | item     2    
Number of letters received purporting to be shareholders | item     7    
Term Loan from Hercules [Member]          
Commitments and Contingencies [Line Items]          
Repayments of debt $ 4,500,000        
Debt instrument, face amount $ 7,500,000        
Convertible Preferred Stock [Member]          
Commitments and Contingencies [Line Items]          
Per share conversion price of preferred stock. | $ / shares $ 3.40        
2018 to 2020 Plans [Member]          
Commitments and Contingencies [Line Items]          
Percentage paid out in cash     50.00%    
Percentage paid out in stock     50.00%    
2019 to 2021 and 2020 to 2022 Plans [Member]          
Commitments and Contingencies [Line Items]          
Percentage paid out in cash     25.00%    
Percentage paid out in stock     75.00%    
PIPE Investors [Member]          
Commitments and Contingencies [Line Items]          
Percentage right to purchase equity securities in future 25.00%        
Right to purchase equity securities in future, term 1 year        
Lock-up agreement term 30 days        
PIPE Investors [Member] | Assuming Conversion Of Series A Convertible Preferred Stock [Member]          
Commitments and Contingencies [Line Items]          
Common stock, shares outstanding | shares 9,410,000        
Percent of outstanding common stock 27.00%        
PIPE Investors [Member] | Assuming Exercise Of All Warrants For Cash [Member]          
Commitments and Contingencies [Line Items]          
Common stock, shares outstanding | shares 18,800,000        
Percent of outstanding common stock 43.00%        
Line of Credit [Member]          
Commitments and Contingencies [Line Items]          
Line of credit, maximum borrowing capacity         $ 5,000,000
Letter of Credit [Member]          
Commitments and Contingencies [Line Items]          
Line of credit, maximum borrowing capacity   $ 2,000,000      
Ability to obtain letter of credit, number of letters of credit | item   1