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Revenue Recognition - Summary of Product Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Product Revenue Allowance and Revenue Categories [Line Items]
Total revenues	$ 13,414	$ 10,575	$ 27,001	$ 24,649
HEPLISAV-B
Product Revenue Allowance and Revenue Categories [Line Items]
Total revenues	11,599	10,158	24,518	24,086
CpG 1018
Product Revenue Allowance and Revenue Categories [Line Items]
Total revenues	1,677		1,677
Product
Product Revenue Allowance and Revenue Categories [Line Items]
Total revenues	$ 13,276	$ 10,158	$ 26,195	$ 24,086

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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