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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 6,040
Provisions related to current period sales	4,117
Credit or payments made during the period	(3,104)
Balance at End of Period	7,053
Accounts Receivable Reserves
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,836
Provisions related to current period sales	7,345
Credit or payments made during the period	(6,820)
Balance at End of Period	$ 3,361