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Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Jan. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001
Business combination, escrow fund date | May 2019 |  |  |  |
Goodwill |  |  |  | $ 2,863 | $ 2,725
IDchecker |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition date | Jun. 17, 2015 |  |  |  |
Total consideration paid | $ 5,900 |  |  |  |
Cash payment for consideration | 5,600 |  |  |  |
Business combination consideration transfer, promissory notes | 300 |  |  |  |
Common stock issued during acquisition, value | $ 2,700 |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |
Business combination, paid earnout shares issued (in shares) |  | 137,306 | 137,306 | 55,297 |
Cash payment to escrow fund related to business acquisition | $ 1,800 |  |  |  |
Business combination, percentage of closing shares in escrow fund (as a percent) | 20.00% |  |  |  |
Business combination, deposited earnout shares in escrow fund (in shares) |  | 27,461 |  |  |
Goodwill | $ 2,873 |  |  |  |

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