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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities $ 55,214 [1] $ 61,923 [2]    
Contingent consideration on acquired business 10,660 9,960 $ 10,400 $ 0
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 44,633 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 55,214 61,923    
Total liabilities measured at fair value 0 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 10,660 9,960    
Liability | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration on acquired business 0 0    
Liability | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration on acquired business 0 0    
Liability | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration on acquired business 10,660 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 44,633 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 33,929 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 13,988 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 7,297 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 99,847 106,242    
Total liabilities measured at fair value 10,660 9,960    
Estimate of Fair Value Measurement | Liability | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration on acquired business 10,660 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 44,633 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 33,929 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 13,988 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 $ 7,297 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 $282
[2] Included in amortized cost and fair value is purchased and accrued interest of $271.