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BUSINESS COMBINATION - ADDITIONAL INFORMATION (Detail) - IDchecker - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Jan. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2015 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |
Acquisition date | Jun. 17, 2015 |  |  |  |
Total consideration paid | $ 5,900 |  |  |  |
Payments to acquire businesses, gross | 5,600 |  |  |  |
Business combination consideration transfer, promissory notes | 300 |  |  |  |
Common stock issued during acquisition, value | $ 2,700 |  |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |
Earnout shares issued (in shares) |  | 137,306 |  | 137,306 | 81,182
Cash payment to escrow fund related to business acquisition | $ 1,800 |  |  |  |
Business combination, percentage of closing shares in escrow fund | 20.00% |  |  |  |
Earnout shares deposited in escrow fund |  | 27,461 |  |  |
Escrow deposit released during period |  |  | $ 1,800 |  |
Goodwill before effect in exchange rates | $ 2,873 |  |  |  |

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