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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 23, 2018 | Oct. 16, 2017 | Jan. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 06, 2019 | Apr. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired |  |  |  | $ 0 | $ 29,744 | $ 0 |  |
Acquisition-related contingent consideration |  |  |  | 1,601 | 3,051 |  |  |
Payment for contingent consideration liability |  |  |  | 1,030 | 1,284 | $ 0 |  |
Revenue from business combinations |  |  |  |  | 9,100 |  |  |
Net loss from business combinations |  |  |  |  | $ 5,300 |  |  |
A2iA |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired | $ 26,800 |  |  |  |  |  |  |
Acquisition-related shares issued (in shares) | 2,514,588 |  |  |  |  |  |  |
Value of common stock issued during acquisition | $ 21,900 |  |  |  |  |  |  |
Transaction-related liabilities | 200 |  |  |  |  |  |  |
Expenses incurred in connection with acquisition | 2,200 |  |  |  |  |  |  |
Payments for cash for collateral | $ 700 |  |  |  |  |  |  |
Payments for collateral, equity (in shares) | 508,479 |  |  |  |  |  |  |
Payments for collateral, equity, value | $ 4,400 |  |  |  |  |  |  |
Period to maintain escrow funds | 24 months |  |  |  |  |  |  |
ICAR |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration paid for acquisition, net of cash acquired |  | $ 3,000 |  |  |  |  |  |
Acquisition-related shares issued (in shares) |  | 584,291 |  |  |  |  |  |
Value of common stock issued during acquisition |  | $ 5,600 |  |  |  |  |  |
Expenses incurred in connection with acquisition |  | 500 |  |  |  |  |  |
Acquisition-related contingent consideration |  | 2,900 |  |  |  |  |  |
Escrow deposit |  | 1,500 |  |  |  |  |  | $ 1,500
ICAR | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  |  |  | $ 1,000 |
ICAR | Q4 Consideration |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration arrangement |  | 1,500 |  |  |  |  |  |
ICAR | Earnout Consideration |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration arrangement |  | 3,800 |  |  |  |  |  |
Acquisition-related contingent consideration |  |  |  | $ 1,800 |  |  |  |
Payment for contingent consideration liability |  |  | $ 1,800 |  |  |  |  |
ICAR | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 13,900 |  |  |  |  |  |

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