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Significant Risks and Uncertainties - Additional Information (Details) $ in Millions			3 Months Ended		9 Months Ended
	Jun. 07, 2021 USD ($)	May 06, 2020 USD ($)	Sep. 30, 2021 USD ($) facility	Sep. 30, 2020 facility	Sep. 30, 2021 USD ($) facility	Sep. 30, 2020 USD ($) facility
Risks And Uncertainties [Line Items]
Sale of net operating losses	$ 1.4	$ 1.2
Incurred loss					$ 12.3	$ 17.2
Cash, cash equivalents and marketable securities			$ 39.0		39.0
Net proceeds from sale receivable					$ 25.7
Channel One [Member] | VA/DoD facilities
Risks And Uncertainties [Line Items]
Number of channels | facility					4	3
Channel One [Member] | VA/DoD facilities | Net Sales
Risks And Uncertainties [Line Items]
Number of channels | facility			4	5
Channel One [Member] | VA/DoD facilities | Net Sales | Revenue from Rights Concentration Risk
Risks And Uncertainties [Line Items]
Percentage of net sales			53.90%	58.60%	52.10%	41.00%
Channel Two [Member] | Net Sales | Revenue from Rights Concentration Risk
Risks And Uncertainties [Line Items]
Percentage of net sales					10.00%
Channel Two [Member] | VA/DoD facilities | Net Sales
Risks And Uncertainties [Line Items]
Number of channels | facility			2		2
Channel Two [Member] | VA/DoD facilities | Net Sales | Revenue from Rights Concentration Risk
Risks And Uncertainties [Line Items]
Percentage of net sales			10.00%
Channel Two [Member] | VA/DoD facilities | Minimum | Net Sales | Revenue from Rights Concentration Risk
Risks And Uncertainties [Line Items]
Percentage of net sales					10.00%

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