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Marketable Securities | 6 Months Ended
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Mar. 31, 2019
Marketable Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES Our marketable securities historically consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. As of March 31, 2019, all of our securities that we held were trading below our amortized cost basis. We determined each decline in value to be temporary in nature. At March 31, 2019 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 2,503 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 2,497 |
Total marketable securities | $ | 2,503 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 2,497 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $3.
At September 30, 2018 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 4,756 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 4,736 |
Total marketable securities | $ | 4,756 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 4,736 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $6.
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, 2019
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Certificates of deposit | $ | — |  |  | $ | — |  |  | $ | 2,497 |  |  | $ | (6 | )
Total | $ | — |  |  | $ | — |  |  | $ | 2,497 |  |  | $ | (6 | )
| September 30, 2018
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Certificates of deposit | $ | — |  |  | $ | — |  |  | $ | 4,736 |  |  | $ | (20 | )
Total | $ | — |  |  | $ | — |  |  | $ | 4,736 |  |  | $ | (20 | )

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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