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Business Combinations (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 31, 2021
Aug. 16, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Business Combination              
Goodwill     $ 105,149,000   $ 105,149,000   $ 8,754,000
Transaction-related expenses     $ 6,300,000 $ 181,000 7,364,000 $ 440,000  
Zio              
Business Combination              
Business acquisition, equity and voting interests acquired   100.00%          
Contingent consideration   $ 22,800,000          
Intangible assets   41,670,000          
Finite-lived intangible assets acquired   $ 33,200,000          
Weighted-average amortization period (in years)   7 years          
Goodwill   $ 70,483,000          
Accounts receivable   3,056,000          
Transaction-related expenses         3,400,000    
Zio | High              
Business Combination              
Contingent consideration   35,000,000          
Zio | Trademarks              
Business Combination              
Finite-lived intangible assets acquired   8,500,000          
Zio | Customer Relationships              
Business Combination              
Finite-lived intangible assets acquired   $ 30,000,000          
Weighted-average amortization period (in years)   7 years          
Zio | Non-Compete Agreements              
Business Combination              
Finite-lived intangible assets acquired   $ 3,000,000          
Weighted-average amortization period (in years)   5 years          
Star Waggons              
Business Combination              
Business acquisition, equity and voting interests acquired 100.00%            
Contingent consideration $ 0            
Intangible assets 33,480,000            
Finite-lived intangible assets acquired $ 24,900,000            
Weighted-average amortization period (in years) 7 years            
Goodwill $ 25,911,000            
Accounts receivable 4,185,000            
Transaction-related expenses         2,400,000    
Star Waggons | Studio segment              
Business Combination              
Change in goodwill         $ 0    
Star Waggons | Trademarks              
Business Combination              
Finite-lived intangible assets acquired 8,600,000            
Star Waggons | Customer Relationships              
Business Combination              
Finite-lived intangible assets acquired $ 22,500,000            
Weighted-average amortization period (in years) 7 years            
Star Waggons | Non-Compete Agreements              
Business Combination              
Finite-lived intangible assets acquired $ 2,300,000            
Weighted-average amortization period (in years) 5 years