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v3.21.1

Risks and Uncertainties - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Customer | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) Customer | Mar. 31, 2020 USD ($)
Concentration Risk [Line Items] |  |  |  |
Unbilled receivables current | $ 2,707 |  | $ 2,707 |
Revenue | 21,604 | $ 9,517 | 48,326 | $ 18,600
Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Proceeds from accounts receivable |  |  | 6,900 |
Proceeds from notes receivable |  |  | 4,200 |
Unbilled receivables current | $ 1,000 |  | $ 1,000 |
Number of customers | Customer | 3 |  | 3 |
Revenue | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers | Customer | 3 |  | 3 |
Revenue | Customer | Unbilled Receivables |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue |  |  | $ 8,900 |
Revenue | Trade Accounts Receivable | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue |  |  | 13,200 |
Revenue | Notes Receivable | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue |  |  | $ 12,700 |

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