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Major Customers and Vendors (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 item customer | Mar. 31, 2020 item customer | Dec. 31, 2020
Purchases | Vendor concentration risk |  |  |
Significant Customers and Vendors |  |  |
Number of vendors | item | 2 | 2 |
Purchases | Vendor concentration risk | Major vendor one |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 24.00% | 22.00% |
Purchases | Vendor concentration risk | Major vendor two |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 9.00% | 14.00% |
Net sales | Customer concentration risk |  |  |
Significant Customers and Vendors |  |  |
Number of customers | customer | 2 | 2 |
Net sales | Customer one | Customer concentration risk |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 20.00% | 27.00% |
Net sales | Customer two | Customer concentration risk |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 13.00% | 14.00% |
Net accounts receivable | Customer one | Customer concentration risk |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 18.00% |  | 19.00%
Net accounts receivable | Customer two | Customer concentration risk |  |  |
Significant Customers and Vendors |  |  |
Percentage of concentration risk | 10.00% |  | 9.00%

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