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Commitments and Contingencies - Additional Information (Details) £ in Thousands, ft² in Thousands, € in Millions |  |  |  |  |  |  | 12 Months Ended |
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Nov. 06, 2019 USD ($) patent | Jul. 31, 2019 claim customer | Aug. 17, 2018 patent | Jul. 07, 2018 patent | Jun. 11, 2018 EUR (€) | Jun. 11, 2018 USD ($) | May 03, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2019 EUR (€) ft² | Sep. 30, 2019 GBP (£) ft² | Sep. 30, 2019 USD ($) ft²
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Company contribution, percent of designated deferral of eligible compensation |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Company contribution, percent of employee compensation eligible for company match |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Employer contribution amount |  |  |  |  |  |  |  | $ 231,000 | $ 123,000 | $ 121,000 |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000.0
Tenant improvement allowances |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000.0
Unamortized lease incentives |  |  |  |  |  |  |  |  |  |  |  |  | 600,000
Rent expense for operating leases |  |  |  |  |  |  |  | 2,100,000 | $ 1,700,000 | $ 600,000 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |
Interest rate floor |  |  |  |  |  |  | 0.045 |  |  |  |  |  |
Minimum unrestricted cash and unused borrowing capacity |  |  |  |  |  |  | $ 15,000,000.0 |  |  |  |  |  |
Adjusted quick ratio requirement |  |  |  |  |  |  | 1.75 |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 0
Line of Credit | Revolving Credit Facility | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.25% |  |  |  |  |  |
France |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  | € 0.4 |  | 400,000
Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  | 0.2 |  | 200,000
United States |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  |  |  | 200,000
Spain |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  | € 0.1 |  | 100,000
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  |  |  |  |  |  |  |  | £ 63 | 78,000
Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  |  |  |  |  |  |  |  |  |  |  | 100,000
Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Building |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Space area subject to lease (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  | 29 | 29 | 29
Pending Litigation | General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |
Pending Litigation | Global Equity & Corporate Consulting, S.L.- Breach of Services Agreement | ICAR |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, amount claimed |  |  |  |  | € 0.8 | $ 900,000 |  |  |  |  |  |  |
Pending Litigation | USAA | Wells Fargo |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed | patent |  |  | 5 | 4 |  |  |  |  |  |  |  |  |
Pending Litigation | USAA | Wells Fargo | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents infringed | patent | 1 |  |  |  |  |  |  |  |  |  |  |  |
Amount awarded in damages to other party | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Pending Litigation | UrbanFT |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits filed | claim |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number of customers in delinquent payment | customer |  | 1 |  |  |  |  |  |  |  |  |  |  |

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