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Marketable Securities (Tables) | 3 Months Ended
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Dec. 31, 2017
Marketable Securities [Abstract] |
Schedule of Marketable Securities | At December 31, 2017 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 24,217 |  |  | $ | — |  |  | $ | (26 | ) |  | $ | 24,191 |
Certificates of deposit | 4,013 |  |  | 1 |  |  | (1 | ) |  | 4,013 |
Current marketable securities | 28,230 |  |  | 1 |  |  | (27 | ) |  | 28,204 |
Non-current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | 4,262 |  |  | — |  |  | (15 | ) |  | 4,247 |
Total marketable securities | $ | 32,492 |  |  | $ | 1 |  |  | $ | (42 | ) |  | $ | 32,451 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $201.
6. MARKETABLE SECURITIES (CONTINUED) At September 30, 2017 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 28,275 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 28,255 |
Certificates of deposit | 3,756 |  |  | 4 |  |  | — |  |  | 3,760 |
Current marketable securities | 32,031 |  |  | 4 |  |  | (20 | ) |  | 32,015 |
Non-current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | 4,757 |  |  | — |  |  | (4 | ) |  | 4,753 |
Total marketable securities | $ | 36,788 |  |  | $ | 4 |  |  | $ | (24 | ) |  | $ | 36,768 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $211.
Schedule of Unrealized Losses on Available-For-Sale Securities | The following tables show the fair values and gross unrealized losses of our available-for-sale marketable securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
| December 31, 2017
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Corporate bonds | $ | 24,191 |  |  | $ | (26 | ) |  | $ | — |  |  | $ | — |
Certificates of deposit | 5,754 |  |  | (16 | ) |  | — |  |  | — |
Total | $ | 29,945 |  |  | $ | (42 | ) |  | $ | — |  |  | $ | — |
| September 30, 2017
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Corporate bonds | $ | 26,196 |  |  | $ | (20 | ) |  | $ | — |  |  | $ | — |
Certificates of deposit | 3,751 |  |  | (4 | ) |  | — |  |  | — |
Total | $ | 29,947 |  |  | $ | (24 | ) |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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