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Organization and Summary of Accounting Policies - Revenues by Sources (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Total revenues $ 717.4 $ 666.2
Patent service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 705.3 $ 656.4
Patent service revenues | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 100.00% 100.00%
Private insurance    
Disaggregation of Revenue [Line Items]    
Total revenues $ 361.0 $ 335.6
Private insurance | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 51.20% 51.10%
Government    
Disaggregation of Revenue [Line Items]    
Total revenues $ 303.6 $ 287.8
Government | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 43.00% 43.80%
Self-pay    
Disaggregation of Revenue [Line Items]    
Total revenues $ 19.8 $ 15.6
Self-pay | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 2.80% 2.40%
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 20.9 $ 17.4
Other | Customer | Revenue    
Disaggregation of Revenue [Line Items]    
Revenue by service type as a proportion of total revenues (percent) 3.00% 2.70%
Other service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 12.1 $ 9.8