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Marketable Securities (Tables) | 6 Months Ended
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Mar. 31, 2018
Marketable Securities [Abstract] |
Schedule of Marketable Securities | At March 31, 2018 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 4,766 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 4,757 |
Non-current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | 2,509 |  |  | — |  |  | (20 | ) |  | 2,489 |
Total marketable securities | $ | 7,275 |  |  | $ | — |  |  | $ | (29 | ) |  | $ | 7,246 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $25.
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):
| March 31, 2018
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Certificates of deposit | 6,745 |  |  | (28 | ) |  | 250 |  |  | (1 | )
Total | $ | 6,745 |  |  | $ | (28 | ) |  | $ | 250 |  |  | $ | (1 | )
| 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 fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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