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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable Reserves    
Product Revenue Allowance and Revenue Categories [Line Items]    
Balance at Beginning of Period $ 2,701 $ 1,272
Provisions related to current period sales 11,417 11,042
Credit or payments made during the period (11,282) (9,613)
Balance at End of Period 2,836 2,701
Revenue Reserve Accruals    
Product Revenue Allowance and Revenue Categories [Line Items]    
Provisions related to current period sales 6,694 6,632
Credit or payments made during the period (4,547) (3,772)
Balance at Beginning of Period 3,893 1,033
Balance at End of Period $ 6,040 $ 3,893