Annual report pursuant to Section 13 and 15(d)

Debt - Convertible Notes (Details)

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Debt - Convertible Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 10, 2021
Apr. 21, 2020
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Oct. 07, 2021
Mar. 22, 2021
Dec. 31, 2019
Aug. 21, 2015
Debt Instrument [Line Items]                    
Conversion of debt to equity         $ 6,288,000 $ 0        
Financing fees incurred                 $ 64,000  
Interest expense       $ 28,000            
Loan received under Paycheck Protection Program   $ 22,000                
Convertible debt | 2015 Notes                    
Debt Instrument [Line Items]                    
Face amount                   $ 1,000,000
Interest rate         8.00%          
Conversion price, percent of per share price         70.00%          
Conversion of debt to equity $ 5,084,000                  
Conversion of debt to equity, accrued interest $ 1,204,404                  
Number of units issued in debt conversion (in shares) 1,497,216                  
Conversion price (in dollars per share) $ 4.20                  
Long-term debt       3,369,000   3,369,000        
Accrued interest       $ 926,000   $ 926,000        
Convertible debt | 2015 Notes | Amendment Number Seven                    
Debt Instrument [Line Items]                    
Face amount             $ 5,500,000      
Convertible debt | Qualified Financing                    
Debt Instrument [Line Items]                    
Event occurrence more than likely probability, percent     50.00%              
Share-settled debt discount     30.00%              
Debt discount         $ 1,886,000          
Convertible debt | Qualified Financing | Amendment Number Six                    
Debt Instrument [Line Items]                    
Face amount               $ 2,000,000