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Marketable Securities (Tables) | 6 Months Ended
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Mar. 31, 2021
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of September 30, 2020 were as follows:
(in thousands) |  | September 30, 2020 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Corporate notes/bonds |  | $ | 58,793 |  |  | $ | 323 |  |  | $ | (17 | ) |  | $ | 59,099 |
Unrealized Gain (Loss) on Investments | The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual securities had been in a continuous unrealized loss position as of September 30, 2020:
(in thousands) |  | September 30, 2020 |
|  | Less than twelve months |  |  | Greater than twelve months |  |  | Total |
|  | Fair Value |  |  | Gross unrealized loss |  |  | Fair Value |  |  | Gross unrealized loss |  |  | Fair Value |  |  | Gross unrealized loss |
Corporate notes/bonds |  | $ | 9,841 |  |  | $ | (17 | ) |  | $ | — |  |  | $ | — |  |  | $ | 9,841 |  |  | $ | (17 | )
Investments Classified by Contractual Maturity Date | The following table presents our marketable securities by contractual maturity date as of September 30, 2020:
(in thousands) |  | September 30, 2020 |
|  | Amortized cost |  |  | Fair value |
Due in one year or less |  | $ | 27,727 |  |  | $ | 27,899 |
Due after one year through three years |  |  | 31,066 |  |  |  | 31,200 |
Total |  | $ | 58,793 |  |  | $ | 59,099 |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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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 No definition available. + Details
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