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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Product Revenue Allowance and Revenue Categories [Line Items]
Concentration risk, percentage	63.00%	68.00%
Remaining reserves balances recorded as accrued liabilities	$ 3.2
Chargebacks and Discounts
Product Revenue Allowance and Revenue Categories [Line Items]
Reserves recorded as reduction of accounts receivable	$ 2.7
Product | Revenue | Credit Concentration Risk
Product Revenue Allowance and Revenue Categories [Line Items]
Concentration risk, customer	three largest Customers

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Product revenue allowance and remaining reserves classified as accrued liabilities.

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Product revenue allowance and reserves classified as reduction in accounts receivable.

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Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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