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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale marketable securities | $ 32,451 | [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] |  |  |  |  |  |
Total assets measured at fair value | 4,520 |  | 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] |  |  |  |  |  |
Total assets measured at fair value | 32,451 |  | 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 | 5,981 |  | 6,388 |  | $ 10,660 | $ 9,960
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 | 5,981 |  | 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 | 5,981 |  | 6,388 |  |  |
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 | 4,520 |  | 39,524 |  |  |
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 | 24,191 |  | 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 |  | 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 | 8,260 |  | 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] |  |  |  |  |  |
Total assets measured at fair value | 36,971 |  | 76,292 |  |  |
Total liabilities measured at fair value | 5,981 |  | 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 | 5,981 |  | 6,388 |  |  |
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 | 4,520 |  | 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 | 24,191 |  | 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 | $ 8,260 |  | $ 8,513 |  |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $201
[2] | Included in amortized cost and fair value is purchased and accrued interest of $211.

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