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Significant Risks and Uncertainties - Schedule of company's net sales (Details) - Net Sales - Revenue from Rights Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Department of Veterans Affairs and Department of Defense [Member]
Concentration Risk [Line Items]
Revenue, percentage	63.60%	59.80%	60.70%	59.00%
National Health Service [Member]
Concentration Risk [Line Items]
Revenue, percentage	24.10%	24.20%	25.60%	28.10%

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