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COMMITMENTS AND CONTINGENCIES - ADDITIONAL INFORMATION (Details) £ in Thousands, ft² in Thousands, € in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 11, 2018 USD ($) | Jun. 11, 2018 EUR (€) | May 03, 2018 USD ($) | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 EUR (€) ft² | Sep. 30, 2018 GBP (£) 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 |  |  |  | $ 123,000 | $ 121,000 | $ 91,000 |  |
Annual base rent |  |  |  | 1,000,000.0 |  |  |  |
Tenant improvement allowances |  |  |  | 1,000,000.0 |  |  |  |
Unamortized lease incentives |  |  |  | 800,000 |  |  |  |
Rent expense for the Company's operating leases |  |  |  | 1,700,000 | $ 600,000 | $ 300,000 |  |
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% |  |  |  |  |
NETHERLANDS |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  | 200,000 |  |  | € 0.2 |
UNITED KINGDOM |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  | 82,000 |  |  |  | £ 63
Other Current Liabilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  |  | 100,000 |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  |  | $ 700,000 |  |  |  |
Building |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Space area subject to lease (in square feet) | ft² |  |  |  | 29 |  |  | 29 | 29
ICAR | SPAIN |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  | $ 100,000 |  |  | € 0.1 |
A2iA | FRANCE |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  | 400,000 |  |  | € 0.4 |
A2iA | UNITED STATES |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  | $ 300,000 |  |  |  |
Global Equity & Corporate Consulting, S.L.- Breach of Services Agreement | Pending Litigation | ICAR |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency, amount claimed | $ 900,000 | € 0.8 |  |  |  |  |  |

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