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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
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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.

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