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Marketable Securities | 3 Months Ended
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Dec. 31, 2020
Marketable Securities [Abstract] |
Marketable Securities | 9. Marketable Securities We did not hold any marketable securities as of December 31, 2020. In December 2020, we sold our remaining marketable securities to partially fund the Arena acquisition, resulting in proceeds of $56.2 million. Neither gross realized gains nor gross realized losses related to the sale were material. 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 |
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 | )
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 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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