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Investments | 9 Months Ended
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Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Investments | 3. Investments Short-term Investments The Company classifies its short-term investments as available-for-sale securities. Available-for-sale securities are carried at fair market value with net unrealized gains and losses reported as a component of accumulated other comprehensive loss in stockholders’ equity. For the three and nine months ended June 30, 2022, the Company realized losses of $4,000 and $22,000, respectively, from the sale of short-term investments. For each of the three and nine months ended June 30, 2021, the Company realized losses of $1,000 from the sale of short-term investments. The Company’s short-term investments were composed of the following (in thousands):
|  | As of June 30, 2022 (in thousands) |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 1,615 |  |  | $ | — |  |  | $ | (17 | ) |  | $ | 1,598 |
|  | As of September 30, 2021 (in thousands) |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 9,511 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 9,496 |
The Company’s short-term investments at June 30, 2022 had contractual maturities ranging from July 2022 to March 2023. Investment in Debt Security During the three and nine months ended June 30, 2021, the Company recognized a gain of $1.7 million and $2.0 million, respectively, in connection with the sale of its interest in a senior secured bond originally issued from an international seismic marine customer.

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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 https://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 https://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 https://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 https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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