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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value of Company's Short-term Investments and Foreign Currency Forward Contracts | The following tables present the fair value of the Company’s short-term investments and foreign currency forward contracts at September 30, 2017, 2016 and 2015 respectively, by valuation hierarchy and input (in thousands):
|  | AS OF SEPTEMBER 30, 2017 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable (Level 2) |  |  | Significant Unobservable (Level 3) |  |  | Totals |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 22,798 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,798 |
Government bonds |  |  | 13,339 |  |  |  | — |  |  |  | — |  |  |  | 13,339 |
Total |  | $ | 36,137 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,137 |
|  | AS OF SEPTEMBER 30, 2016 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable (Level 2) |  |  | Significant Unobservable (Level 3) |  |  | Totals |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 17,323 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,323 |
Government bonds |  |  | 10,168 |  |  |  | — |  |  |  | — |  |  |  | 10,168 |
Foreign currency forward contract |  |  | — |  |  |  | 5 |  |  |  | — |  |  |  | 5 |
Total |  | $ | 27,491 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 27,496 |
|  | AS OF SEPTEMBER 30, 2015 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable (Level 2) |  |  | Significant Unobservable (Level 3) |  |  | Totals |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 15,161 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,161 |
Government bonds |  |  | 2,951 |  |  |  | — |  |  |  | — |  |  |  | 2,951 |
Foreign currency forward contract |  |  | — |  |  |  | (18 | ) |  |  | — |  |  |  | (18 | )
Total |  | $ | 18,112 |  |  | $ | (18 | ) |  | $ | — |  |  | $ | 18,094 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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