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

Income Taxes - Summary of reconciliation of the statutory U.S. federal rate to the Company's effective tax rate (Detail)

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Income Taxes - Summary of reconciliation of the statutory U.S. federal rate to the Company's effective tax rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Tax at federal statutory rate (21.00%) (21.00%)
State taxes, net of federal benefit (6.70%) (6.30%)
Permanent differences 0.20% 1.60%
Change in valuation allowance 32.50% 29.50%
Tax credits (5.00%) (3.80%)
Provision for taxes 0.00% 0.00%