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Significant Risks and Uncertainties - Schedule of company's net sales (Details) - Net Sales	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Department of Veterans Affairs and Department of Defense [Member]
Concentration Risk [Line Items]
Revenue, percentage	55.50%	61.90%
National Health Service [Member]
Concentration Risk [Line Items]
Revenue, percentage	25.80%	32.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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