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Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 41,890 | $ 18,051
Gross Unrealized Gains | 111 | 4
Gross Unrealized Losses | (3) | (1)
Fair Market Value | 41,998 | 18,054
US Treasury | Short-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 10,245 | 4,240
Gross Unrealized Gains | 38 | 2
Gross Unrealized Losses | 0 | 0
Fair Market Value | 10,283 | 4,242
US Treasury | Long-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 1,102
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Market Value |  | 1,101
Asset-backed securities | Short-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 4,723 |
Gross Unrealized Gains | 36 |
Gross Unrealized Losses | 0 |
Fair Market Value | 4,759 |
Corporate debt securities | Short-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 24,956 | 12,258
Gross Unrealized Gains | 37 | 2
Gross Unrealized Losses | 0 | 0
Fair Market Value | 24,993 | 12,260
Corporate debt securities | Long-term |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,966 | 451
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | 0
Fair Market Value | $ 1,963 | $ 451

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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