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

Revenues - Summary of Disaggregation of Accounts Receivable on the Basis of Customers (Detail)

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Revenues - Summary of Disaggregation of Accounts Receivable on the Basis of Customers (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Diaggregation Of Accounts Receivable On The Basis Of Customers [Line Items]        
Allowance for doubtful accounts $ 0 $ 0 $ 0 $ 0
Total accounts receivable 4,192 2,903 2,903 4,328
US Federal Government and Agencies [Member]        
Diaggregation Of Accounts Receivable On The Basis Of Customers [Line Items]        
Accounts receivable, Before allowance for doubtful accounts 2,679 1,335 1,335 3,349
Commercial and Other [Member]        
Diaggregation Of Accounts Receivable On The Basis Of Customers [Line Items]        
Accounts receivable, Before allowance for doubtful accounts $ 1,513 $ 1,568 $ 1,568 $ 979