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Fair Value Measurements (Tables) | 3 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets Measured at Fair Value on a Recurring Basis | The Company's financial assets measured at fair value on a recurring basis subject to the disclosure requirements at December 31, 2021, were as follows (in thousands):
|  | Fair Value Measurements at Reporting Date Using |  |
|  | Quoted Prices in Active Markets for Identical Securities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Fair Value at December 31, 2021
Cash equivalents |  | $ | 19,265 |  |  | $ | 779 |  |  | $ | — |  |  | $ | 20,044 |
Short-term investments |  |  |  |  |  |  |  |
Available-for-sale securities — certificates of deposits |  | — |  |  | 992 |  |  | — |  |  | 992 |
Available-for-sale securities — corporate bonds and notes |  | — |  |  | 177,093 |  |  | — |  |  | 177,093 |
Available-for-sale securities — municipal bonds and notes |  | — |  |  | 15,359 |  |  | — |  |  | 15,359 |
Available-for-sale securities — U.S. government securities |  | — |  |  | 135,934 |  |  | — |  |  | 135,934 |
Available-for-sale securities — U.S. government agency securities |  | — |  |  | 17,170 |  |  | — |  |  | 17,170 |
Long-term investments |  |  |  |  |  |  |  |
Available-for-sale securities — corporate bonds and notes |  | — |  |  | 48,638 |  |  | — |  |  | 48,638 |
Available-for-sale securities — municipal bonds and notes |  | — |  |  | 2,239 |  |  | — |  |  | 2,239 |
Available-for-sale securities — U.S. government securities |  | — |  |  | 24,341 |  |  | — |  |  | 24,341 |
Available-for-sale securities — U.S. government agency securities |  | — |  |  | 1,773 |  |  | — |  |  | 1,773 |
Total |  | $ | 19,265 |  |  | $ | 424,318 |  |  | $ | — |  |  | $ | 443,583 |
The Company's financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2021, were as follows (in thousands):
|  | Fair Value Measurements at Reporting Date Using |  |
|  | Quoted Prices in Active Markets for Identical Securities (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Fair Value at September 30, 2021
Cash equivalents |  | $ | 17,150 |  |  | $ | 4,397 |  |  | $ | — |  |  | $ | 21,547 |
Short-term investments |  |  |  |  |  |  |  |
Available-for-sale securities — certificates of deposits |  | — |  |  | 255 |  |  | — |  |  | 255 |
Available-for-sale securities — corporate bonds and notes |  | — |  |  | 186,107 |  |  | — |  |  | 186,107 |
Available-for-sale securities — municipal bonds and notes |  | — |  |  | 13,566 |  |  | — |  |  | 13,566 |
Available-for-sale securities — U.S. government securities |  | — |  |  | 102,615 |  |  | — |  |  | 102,615 |
Available-for-sale securities — U.S. government agency securities |  | — |  |  | 27,087 |  |  | — |  |  | 27,087 |
Long-term investments |  |  |  |  |  |  |  |
Available-for-sale securities — corporate bonds and notes |  | — |  |  | 53,107 |  |  | — |  |  | 53,107 |
Available-for-sale securities — municipal bonds and notes |  | — |  |  | 11,111 |  |  | — |  |  | 11,111 |
Available-for-sale securities — U.S. government securities |  | — |  |  | 59,608 |  |  | — |  |  | 59,608 |
Available-for-sale securities — U.S. government agency securities |  | — |  |  | 8,952 |  |  | — |  |  | 8,952 |
Total |  | $ | 17,150 |  |  | $ | 466,805 |  |  | $ | — |  |  | $ | 483,955 |
Property, Plant and Equipment | Impairment charges were allocated to the following income statement line items for the three months ended December 31, 2021 and 2020 (in thousands):
|  | Three months ended December 31,
|  | 2021 |  | 2020
Cost of net product revenue |  | $ | — |  |  | $ | 1,968 |
Cost of net service revenue |  | — |  |  | 1 |
Sales and marketing |  | 6,175 |  |  | 1,259 |
Research and development |  | — |  |  | 3,129 |
General and administrative |  | — |  |  | 516 |
Total impairment charges |  | $ | 6,175 |  |  | $ | 6,873 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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=123874694&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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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