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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2021
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:
|  | June 30, 2021 |
|  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (a) |  | $ | 56,229 |  |  | $ | 56,229 |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, $23,730 at cost (a) (b) |  |  | 23,730 |  |  |  | 7,999 |  |  |  | 15,731 |
Corporate bonds, $25,734 at cost (a) (b) |  |  | 25,719 |  |  |  | 5,002 |  |  |  | 20,717 |
Total assets |  | $ | 105,678 |  |  | $ | 69,230 |  |  | $ | 36,448 |
|  | September 30, 2020 |
|  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Marketable Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (a) |  | $ | 101,437 |  |  | $ | 101,437 |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, $9,883 at cost (a) (b) |  |  | 9,883 |  |  |  | - |  |  |  | 9,883 |
Corporate bonds, $1,780 at cost (a) (b) |  |  | 1,779 |  |  |  | - |  |  |  | 1,779 |
Total assets |  | $ | 113,099 |  |  | $ | 101,437 |  |  | $ | 11,662 |
| (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) | 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.

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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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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