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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Valuation And Qualifying Accounts Disclosure [Line Items]  
Provisions related to current period sales $ 1,641
Credit or payments made during the period (1,533)
Balance at Beginning of Period 6,040
Balance at End of Period 6,148
Accounts Receivable Reserves  
Valuation And Qualifying Accounts Disclosure [Line Items]  
Balance at Beginning of Period 2,836
Provisions related to current period sales 1,962
Credit or payments made during the period (2,469)
Balance at End of Period $ 2,329