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Summary of Significant Accounting Policies - Major Customers (Detail) | 3 Months Ended
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Mar. 31, 2020 Customer
Customer Concentration Risk | Sales Revenue, Net |
Summary Of Significant Accounting Policies [Line Items] |
Number of major customers that each accounted for more than 10% of total revenues | 5
Concentration risk, percentage | 96.00%
Credit Concentration Risk | Accounts Receivable |
Summary Of Significant Accounting Policies [Line Items] |
Concentration risk, percentage | 94.00%
Number of major customers that each accounted for more than 10% of total accounts receivable | 5

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