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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%