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Discontinued Operations - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Dec. 09, 2020
Business Acquisition [Line Items]        
Proceeds from sale of business, net of cash transferred $ 2,747      
Nutrisystem, Inc.        
Business Acquisition [Line Items]        
Customary indebtedness and cash adjustments       $ 558,900
Transaction costs directly related to disposition of Nutrition   $ 11,200    
Proceeds from sale of business, net of cash transferred   $ 550,400    
Nutrisystem, Inc. | Other Current Assets        
Business Acquisition [Line Items]        
Additional proceeds from sale of businesses after working capital adjustment     $ 2,700