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(Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale marketable securities $ 36,768 [1] $ 61,923 [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 39,524 44,319  
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 36,768 61,923  
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 6,388 9,960 $ 0
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 6,388 9,960  
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 6,388 9,960  
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 39,524 44,319  
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  
Corporate bonds | 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  
Corporate bonds | 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 28,255 28,767  
Corporate bonds | 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  
Commercial paper | 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  
Commercial paper | 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   23,943  
Commercial paper | 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  
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 8,513 7,309  
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  
Government municipal bonds | 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  
Government municipal bonds | 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   1,904  
Government municipal bonds | 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 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets measured at fair value 76,292 106,242  
Total liabilities measured at fair value 6,388 9,960  
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 6,388 9,960  
Estimate of Fair Value Measurement | Money Market Funds | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 39,524 44,319  
Estimate of Fair Value Measurement | Corporate bonds | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale marketable securities 28,255 28,767  
Estimate of Fair Value Measurement | Commercial paper | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale marketable securities   23,943  
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 $ 8,513 7,309  
Estimate of Fair Value Measurement | Government municipal bonds | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale marketable securities   $ 1,904  
[1] Included in amortized cost and fair value is purchased and accrued interest of $211.
[2] Included in amortized cost and fair value is purchased and accrued interest of $271