Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Convertible Notes 2020 (Details)

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Long-term Debt - Convertible Notes 2020 (Details) - 2020 Convertible Notes - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Gross proceeds from issuance $ 2,000,000.0        
Interest rate 6.00%   6.00%    
Minimum gross proceeds from sale of preferred stock required for conversion $ 2,000,000.0        
Conversion price as percentage of the price per share paid by the other investors 80.00%        
Embedded derivative fair value $ 1,000,000.0   $ 1,000,000.0    
Initial carrying value 3,000,000.0   3,000,000.0    
Accrued interest, current   $ 0   $ 0 $ 100,000
Total interest incurred       $ 300,000  
Maximum          
Debt Instrument [Line Items]          
Total interest incurred   $ 100,000 $ 100,000    
Series B-1 Preferred Stock          
Debt Instrument [Line Items]          
Minimum gross proceeds from sale of preferred stock required for conversion $ 100,000,000.0