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(Financial Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale marketable securities $ 4,736 [1] $ 36,768 [2]    
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 24,318 39,524    
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 4,736 36,768    
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 10,065 6,388 $ 6,388 $ 9,960
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 10,065 6,388    
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 10,065 6,388    
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 24,318 39,524    
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    
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    
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    
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 4,736 8,513    
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]        
Assets, Fair Value Disclosure 29,054 76,292    
Total liabilities measured at fair value 10,065 6,388    
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 10,065 6,388    
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 24,318 39,524    
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    
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 $ 4,736 $ 8,513    
[1] Included in amortized cost and fair value is purchased and accrued interest of $6.
[2] Included in amortized cost and fair value is purchased and accrued interest of $211