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Significant Risks and Uncertainties (Tables) | 9 Months Ended
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Sep. 30, 2021
Risks And Uncertainties [Abstract] |
Schedule of revenue channels accounted for 10% or more of the Company's net sales |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2021 |  |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Revenue channel: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Department of Veterans Affairs and Department of Defense |  | 63.6% |  |  |  | 59.8% |  |  |  | 60.7% |  |  |  | 59.0% |
National Health Service |  | 24.1% |  |  |  | 24.2% |  |  |  | 25.6% |  |  |  | 28.1% |

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