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Short-term Investments | 12 Months Ended
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Sep. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Short-term Investments | 2. Short-term Investments During the fiscal years ended September 30, 2017, 2016 and 2015 the Company realized losses of $3,000, $5,000 and $7,000, respectively, from the sale of short-term investments. The realized losses are recorded in Other Income (Expense) on the consolidated statements of operations. At September 30, 2017, 2016 and 2015, the Company’s short-term investments were composed of the following (in thousands):
|  | AS OF SEPTEMBER 30, 2017 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 22,829 |  |  | $ | — |  |  | $ | (31 | ) |  | $ | 22,798 |
Government bonds |  |  | 13,363 |  |  |  | — |  |  |  | (24 | ) |  |  | 13,339 |
Total |  | $ | 36,192 |  |  | $ | — |  |  | $ | (55 | ) |  | $ | 36,137 |
|  | AS OF SEPTEMBER 30, 2016 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 17,342 |  |  | $ | — |  |  | $ | (19 | ) |  | $ | 17,323 |
Government bonds |  |  | 10,169 |  |  |  | — |  |  |  | (1 | ) |  |  | 10,168 |
Total |  | $ | 27,511 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 27,491 |
|  | AS OF SEPTEMBER 30, 2015 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 15,166 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 15,161 |
Government bonds |  |  | 2,948 |  |  |  | 3 |  |  |  | — |  |  |  | 2,951 |
Total |  | $ | 18,114 |  |  | $ | 3 |  |  | $ | (5 | ) |  | $ | 18,112 |
The Company’s short-term investments have contractual maturities ranging from October 2017 to October 2019.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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