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Short-term Investments | 3 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Short-term Investments | 3. 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 months ended December 31, 2021, the Company realized losses of $7,000 from the sale of short-term investments. No gains or losses were realized during the three months ended December 2020 from the sale of short-term investments. The Company’s short-term investments were composed of the following (in thousands):
|  | As of December 31, 2021 (in thousands) |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 7,649 |  |  | $ | — |  |  | $ | (24 | ) |  | $ | 7,625 |
|  | 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 December 31, 2021 had contractual maturities of $6.7 million due within one year and $0.9 million due between January 2023 to March 2023.

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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 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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