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Revenue Recognition - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Deferred contract liabilities | $ 0 |  | $ 0 |  | $ 0
Deferred contract costs | 0 |  | 0 |  | 0
Revenue | 9,517,000 | $ 11,845,000 | 18,600,000 | $ 22,304,000 |
Cost of revenue recognized from deferred contract cost | 0 | 8,000 | 0 | 8,000 |
Value of notes with customer | 1,704,000 |  | 1,704,000 |  | $ 3,472,000
Cost of revenue | 18,002,000 | 15,772,000 | 33,210,000 | 30,557,000 |
Product |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | 0 |  |  |  |
Partially financed product sale | 12,500,000 |  |  |  |
Cost of revenue | 0 |  |  |  |
Payments received from customer | 3,000,000 |  |  |  |
Secured Promissory Note |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Value of notes with customer | $ 10,000,000 |  | 10,000,000 |  |
Term of the notes | 3 years |  |  |  |
Monthly principal and interest payments | $ 300,000 |  |  |  |
Frequency of payments | monthly |  |  |  |
Deferred Contract Liability |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 0 | $ 100,000 | $ 0 | $ 100,000 |

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