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

Income Taxes - Summary of Reconciliation Between Income Taxes Computed at the U.S. Statutory Income Tax Rate (Detail)

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Income Taxes - Summary of Reconciliation Between Income Taxes Computed at the U.S. Statutory Income Tax Rate (Detail) - 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 Rate Reconciliation, Amount [Abstract]            
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount         $ (8,509) $ (7,641)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount         (947) (2,161)
Change in valuation allowance         1,016  
Rate change         2,856  
Credits         (811) (541)
Permanent differences and other         307 (41)
Revaluation of warrants         1,572 (49)
Uncertain tax provision         226 (984)
Foreign withholding tax         420  
Foreign rate differential         (1,448) (1,524)
Total income tax benefit $ (3,710) $ (1,518) $ (7,628) $ (5,376) $ (5,318) $ (12,941)