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Revenue Recognition - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 12,153,000 | $ 13,270,000 | $ 34,457,000 | $ 40,454,000 |
Cost of revenue recognized from deferred contract cost | 35,000 |  | 27,000 |  |
Deferred Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Deferred contract liabilities | 100,000 |  | 100,000 |  | $ 200,000
Prepaid Expenses and Other Current Assets |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Deferred contract costs | 0 |  | 0 |  | $ 27,000
Deferred Contract Liability |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 42,000 |  | $ 100,000 |  |

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