Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Derivative liability (Details)

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Summary of Significant Accounting Policies - Derivative liability (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Jun. 21, 2021
Feb. 04, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2021
Embedded Derivative Liability                
Conversion price         85.00%   80.00%  
Percentage of shares issued to investors, conversion price equal     80.00% 80.00%        
Unamortized debt discount     $ 118     $ 63 $ 118 $ 63
Loss on extinguishment of debt           (865)   $ (12,685)
2021 Convertible Notes                
Embedded Derivative Liability                
Interest rate   8.00%            
Number of shares issued upon conversion of debt               4,408,672
Gross proceeds from issuance   $ 30,000            
Minimum gross proceeds from sale of preferred stock required for conversion   $ 100,000            
Conversion Price As Percentage Of The Price Per Share Paid By The Other Investors 80.00% 80.00%            
Additional consideration receivable in shares               1,000,000
Carrying value           32,800   $ 32,800
Embedded derivative liability           19,700   19,700
Accrued interest, current           $ 200   200
Loss on extinguishment of debt               $ (900)
2021 Convertible Notes | NHIC Sub Inc                
Embedded Derivative Liability                
Additional consideration receivable in shares 1,000,000