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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale marketable securities $ 19,241 [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 53,874   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 19,241   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 9,422 $ 10,068 9,960 $ 10,587 $ 10,522 $ 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 9,422   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 9,422   9,960      
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 53,874   44,319      
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      
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 10,213   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   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 1,999   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   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 7,029   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 73,115   106,242      
Total liabilities measured at fair value 9,422   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 9,422   9,960      
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 53,874   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 10,213   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 1,999   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 $ 7,029   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 $175
[2] Included in amortized cost and fair value is purchased and accrued interest of $271.