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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale marketable securities $ 46,998 [1] $ 44,439 [2]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents and marketable securities measured at fair value 19,199 19,630
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents and marketable securities measured at fair value 46,998 44,439
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents and marketable securities measured at fair value 0 0
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 19,199 19,630
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 31,743 26,694
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 3,987 3,997
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 10,023 13,748
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 1,245  
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 [Member] | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total cash equivalents and marketable securities measured at fair value 66,197 64,069
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 19,199 19,630
Estimate of Fair Value Measurement [Member] | Corporate Bonds | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale marketable securities 31,743 26,694
Estimate of Fair Value Measurement [Member] | Commercial Paper | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale marketable securities 3,987 3,997
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 10,023 $ 13,748
Estimate of Fair Value Measurement [Member] | 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 $ 1,245  
[1] Included in amortized cost and fair value is purchased and accrued interest of $262
[2] Included in amortized cost and fair value is purchased and accrued interest of $213.