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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value   $ 56,700    
Total liabilities measured at fair value $ 0 0    
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value   0    
Total liabilities measured at fair value 0 0    
Fair Value, Inputs, Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration fair value 14,766 5,407 $ 10,147 $ 10,065
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value   0    
Total liabilities measured at fair value 14,766 5,407    
Contingent Consideration | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration fair value 0 0    
Contingent Consideration | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration fair value 0 0    
Contingent Consideration | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration fair value 14,766 5,407    
Money market | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents   56,700    
Money market | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents   0    
Money market | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents   0    
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total assets measured at fair value   56,700    
Total liabilities measured at fair value 14,766 5,407    
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration fair value $ 14,766 5,407    
Estimate of Fair Value Measurement | Money market | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents   $ 56,700