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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B® $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Product Revenue Allowance and Revenue Categories [Line Items]
Balance at December 31, 2018	$ 2,305
Provision related to current period sales	12,661
Credit or payments made during the period	(9,097)
Balance at September 30, 2019	5,869
Chargebacks, distribution fees, discounts and other fees
Product Revenue Allowance and Revenue Categories [Line Items]
Balance at December 31, 2018	1,736
Provision related to current period sales	10,937
Credit or payments made during the period	(8,689)
Balance at September 30, 2019	3,984
Returns
Product Revenue Allowance and Revenue Categories [Line Items]
Balance at December 31, 2018	569
Provision related to current period sales	1,724
Credit or payments made during the period	(408)
Balance at September 30, 2019	$ 1,885