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Revenue Recognition - Summary of Product Revenue Allowance and Reserve Categories (Detail) - HEPLISAV-B® $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Product Revenue Allowance and Revenue Categories [Line Items]
Balance at December 31, 2018	$ 2,305
Provision related to current period sales	7,489
Credit or payments made during the period	(4,915)
Balance at June 30, 2019	4,879
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	6,418
Credit or payments made during the period	(4,698)
Balance at June 30, 2019	3,456
Returns
Product Revenue Allowance and Revenue Categories [Line Items]
Balance at December 31, 2018	569
Provision related to current period sales	1,071
Credit or payments made during the period	(217)
Balance at June 30, 2019	$ 1,423