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Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Product Revenue Allowance and Revenue Categories [Line Items] |  |
Concentration risk, percentage | 64.00% | 56.00%
Remaining reserves balances recorded as accrued liabilities | $ 2.4 |
Chargebacks and Discounts |  |
Product Revenue Allowance and Revenue Categories [Line Items] |  |
Reserves recorded as reduction of accounts receivable | $ 2.5 |
Product | Revenue | Credit Concentration Risk |  |
Product Revenue Allowance and Revenue Categories [Line Items] |  |
Concentration risk, customer | three largest Customers |

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