Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Property and Equipment (Details)

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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 09, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 09, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]              
Property and equipment, gross   $ 2,190     $ 2,190   $ 2,041
Accumulated amortization and depreciation   (1,018)     (1,018)   (849)
Property and equipment, net   1,172     $ 1,172   $ 1,192
Depreciation $ 0 100 $ 100 $ 200   $ 200  
Furniture, fixtures, and equipment              
Property, Plant and Equipment [Line Items]              
Estimated useful life         5 years   7 years
Property and equipment, gross   555     $ 555   $ 555
Computer hardware              
Property, Plant and Equipment [Line Items]              
Estimated useful life         5 years   5 years
Property and equipment, gross   1,063     $ 1,063   $ 868
Computer software              
Property, Plant and Equipment [Line Items]              
Property and equipment, gross   151     $ 151   $ 197
Computer software | Minimum              
Property, Plant and Equipment [Line Items]              
Estimated useful life         1 year   1 year
Computer software | Maximum              
Property, Plant and Equipment [Line Items]              
Estimated useful life         3 years   3 years
Leasehold improvements              
Property, Plant and Equipment [Line Items]              
Property and equipment, gross   $ 421     $ 421   $ 421