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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 6,040
Provisions related to current period sales	8,962
Credit or payments made during the period	(6,653)
Balance at End of Period	8,349
Accounts Receivable Reserves
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,836
Provisions related to current period sales	13,549
Credit or payments made during the period	(12,369)
Balance at End of Period	$ 4,016