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Concentrations - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounts Receivable | Customer Concentration Risk | Two Customers |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue | 95.00% | 81.00% |  |  |  |
Revenue | Customer Concentration Risk | Three Customers |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue |  |  | 85.00% |  | 69.00% |
Revenue | Customer Concentration Risk | Four Customers |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue |  |  |  | 82.00% |  | 74.00%
Accounts Payables | Supplier Concentration Risk | One Vendor |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue |  | 26.00% |  |  |  |
Accounts Payables | Supplier Concentration Risk | Three Vendors [Member] |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue | 59.00% |  |  |  |  |
Cost of Goods Sold | Supplier Concentration Risk | Two Supplier |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Percentage of Total Revenue |  |  | 70.00% | 57.00% | 64.00% | 53.00%

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