General form of registration statement for all companies including face-amount certificate companies

Income Tax - Additional Information (Details)

v3.21.2
Income Tax - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Effective income tax reconciliation percentage         0.00% 0.00%
Federal statutory income tax rate percentage         21.00% 21.00%
Income tax expense benefit $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Unrecognized tax benefits if recognized impact on the effective tax rate         0 4,800
Domestic Tax Authority [Member]            
Net operating loss carryovers         $ 117,200 $ 134,600
Percentage of taxable income that can be used to set off operating loss carry forwards         80.00%  
Domestic Tax Authority [Member] | Before Two Thousand And Eighteen [Member] | Year Two Thousand And Thirty Three To Year Two Thousand And Thirty Seven [Member]            
Tax credit carry forward         $ 35,000  
Domestic Tax Authority [Member] | After Two Thousand And Seventeen [Member]            
Net operating loss carryovers         $ 82,300  
Tax Year 2014 [Member]            
Open Tax Year         2014  
Tax Year 2020 [Member]            
Open Tax Year         2020