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(Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale marketable securities [1]   $ 4,736  
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure $ 56,700 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]      
Assets, Fair Value Disclosure 0 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 5,407 10,065 $ 6,388
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure 0 0  
Total liabilities measured at fair value 5,407 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 5,407 10,065  
Money Market Funds | 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 24,318  
Money Market Funds | 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 Funds | 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  
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   4,736  
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  
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure 56,700 29,054  
Total liabilities measured at fair value 5,407 10,065  
Estimate of Fair Value Measurement [Member] | Contingent Consideration | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent consideration fair value 5,407 10,065  
Estimate of Fair Value Measurement [Member] | Money Market Funds | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents $ 56,700 24,318  
Estimate of Fair Value Measurement [Member] | 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   $ 4,736  
[1] Included in amortized cost and fair value is purchased and accrued interest of $6