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Revenue Recognition - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Product Revenue Allowance and Revenue Categories [Line Items] |  |
Concentration risk, percentage | 66.00% | 64.00%
Product | Revenue | Credit Concentration Risk |  |
Product Revenue Allowance and Revenue Categories [Line Items] |  |
Concentration risk, customer | three largest Customers |

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