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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities $ 4,247 [1] $ 4,736 [2]    
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 28,010 24,318    
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 4,247 4,736    
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 10,147 10,065 $ 5,981 $ 6,388
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 0    
Total liabilities measured at fair value 10,147 10,065    
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 10,147 10,065    
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 28,010 24,318    
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 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 0    
Certificates of Deposit | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities 0 0    
Certificates of Deposit | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities 4,247 4,736    
Certificates of Deposit | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities 0 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 32,257 29,054    
Total liabilities measured at fair value 10,147 10,065    
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 10,147 10,065    
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 28,010 24,318    
Estimate of Fair Value Measurement | Certificates of Deposit | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities $ 4,247 $ 4,736    
[1] Included in amortized cost and fair value is purchased and accrued interest of $12
[2] Included in amortized cost and fair value is purchased and accrued interest of $6.