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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B
$ in Thousands
 9 Months Ended
Sep. 30, 2020
USD ($)
Product Revenue Allowance and Revenue Categories [Line Items]  
Provisions related to current period sales $ 5,029
Credit or payments made during the period (3,240)
Balance at Beginning of Period 3,893
Balance at End of Period 5,682
Accounts Receivable Reserves  
Product Revenue Allowance and Revenue Categories [Line Items]  
Balance at Beginning of Period 2,701
Provisions related to current period sales 8,806
Credit or payments made during the period (7,945)
Balance at End of Period $ 3,562