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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Summary of Financial Assets that are Measured at Fair Value and Indicates the Fair Value Hierarchy of the Valuation Inputs | The following table presents information about our financial assets that are measured at fair value and indicates the fair value hierarchy of the valuation inputs used (dollars in thousands) as of:
|  | March 31, 2023 |
|  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Level 1: |  |  |  |  |  |  |  |  |
Money market funds $62,219 at cost (a) |  | $ | 62,219 |  |  | $ | 62,219 |  |  | $ | - |
Government securities $6,193 at cost (a,b) |  |  | 6,132 |  |  |  | 299 |  |  |  | 5,833 |
Level 2: |  |  |  |  |  |  |  |  |
Government securities $6,085 at cost (b) |  |  | 6,080 |  |  |  | - |  |  |  | 6,080 |
Time deposits, $4,016 at cost (a) |  |  | 4,016 |  |  |  | 4,016 |  |  |  | - |
Commercial paper, $1,982 at cost (b) |  |  | 1,982 |  |  |  | - |  |  |  | 1,982 |
Corporate bonds, $13,520 at cost (b) |  |  | 13,442 |  |  |  | - |  |  |  | 13,442 |
Debt securities, $2,000 at cost (c) |  |  | 2,669 |  |  |  | - |  |  |  | - |
Total assets |  | $ | 96,540 |  |  | $ | 66,534 |  |  | $ | 27,337 |
|  | September 30, 2022 |
|  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Level 1: |  |  |  |  |  |  |  |  |
Money market funds $59,146 at cost (a) |  | $ | 59,138 |  |  | $ | 59,138 |  |  | $ | - |
Government securities $4,976 at cost (b) |  |  | 4,892 |  |  |  | - |  |  |  | 4,892 |
Level 2: |  |  |  |  |  |  |  |  |
Government securities $2,377 at cost (b) |  |  | 2,361 |  |  |  | - |  |  |  | 2,361 |
Time deposits, $1,472 at cost (a) |  |  | 1,472 |  |  |  | 1,472 |  |  |  | - |
Commercial paper, $7,648 at cost (b) |  |  | 7,647 |  |  |  | - |  |  |  | 7,647 |
Corporate bonds, $17,328 at cost (b) |  |  | 17,001 |  |  |  | - |  |  |  | 17,001 |
Debt securities, $2,000 at cost (c) |  |  | 2,000 |  |  |  | - |  |  |  | - |
Total assets |  | $ | 94,511 |  |  | $ | 60,610 |  |  | $ | 31,901 |
(a) Money market funds and other highly liquid investments with original maturities of 90 days or less are included within Cash and cash equivalents in the Condensed Consolidated Balance Sheets. (b) Government securities, commercial paper and corporate bonds with original maturities greater than 90 days are included within Marketable securities in the Condensed Consolidated Balance Sheets and classified as current or noncurrent based upon whether the maturity of the financial asset is less than or greater than 12 months. (c) Debt securities are included within Prepaid and other current assets and Other assets in the Condensed Consolidated Balance Sheets and classified as current or noncurrent based upon whether the maturity of the financial asset is less than or greater than 12 months. During the second quarter of fiscal year 2023, we obtained debt securities in a privately held company as part of a non-cash transaction.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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