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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B®
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
Accounts Receivable Reserves  
Product Revenue Allowance and Revenue Categories [Line Items]  
Balance at Beginning of Period $ 2,701
Provisions related to current period sales 3,594
Credit or payments made during the period (4,230)
Balance at End of Period 2,065
Revenue Reserve Accruals  
Product Revenue Allowance and Revenue Categories [Line Items]  
Balance at Beginning of Period 3,893
Provisions related to current period sales 2,793
Credit or payments made during the period (2,816)
Balance at End of Period $ 3,870