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STOCKHOLDERS' EQUITY - ADDITIONAL INFORMATION (Detail) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Jan. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 10, 2017 | Mar. 09, 2017 | Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Estimated average forfeiture rate |  |  |  | 12.00% |  |  |  |  |
Excess tax benefit on stock option exercises |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Unrecognized compensation expense |  |  |  | $ 10,700,000 |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  | 1 year 11 months 19 days |  |  |  |  |
Purchase of common stock (in shares) |  |  | 3,647,705 | 2,845,866 | 3,015,374 | 3,647,705 |  |  | 2,334,326
Recognized compensation expense |  |  |  | $ 5,478,000 | $ 4,079,000 | $ 3,367,000 |  |  |
Total intrinsic value of options exercised |  |  |  | $ 1,400,000 | $ 3,300,000 | $ 600,000 |  |  |
Weighted average fair value of options granted (in dollars per share) |  |  |  | $ 4.28 | $ 3.29 | $ 2.83 |  |  |
Aggregate intrinsic value of options |  |  |  | $ 15,600,000 | $ 14,200,000 |  |  |  |
Percentage of earnout shares vest and eligible for resale |  |  |  |  | 12.50% |  |  |  |
Percentage of remaining earnout shares vest and eligible for resale |  |  |  |  | 87.50% |  |  |  |
Earnout Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 412,000 | $ 292,000 | $ 47,000 |  |  |
Common stock trading period |  |  |  | 10 days |  |  |  |  |
IDchecker |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |  |  |  |  |
Earnout shares issued (in shares) |  | 137,306 | 137,306 |  | 81,182 |  |  |  |
IDchecker | Closing Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 1,200,000 | $ 1,200,000 | $ 300,000 |  |  |
Unrecognized compensation expense |  |  |  | $ 0 |  |  |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |  |  |  |  |
Vesting period of shares received | 27 months |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance units, threshold for partial vesting (in dollars per share) |  |  |  | $ 16.00 |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  | 2 years 6 months 26 days |  |  |  |  |
Options outstanding (in shares) |  |  | 802,917 | 2,357,021 | 2,046,169 | 802,917 |  |  | 1,101,303
Recognized compensation expense |  |  |  | $ 4,000,000 | $ 2,700,000 | $ 1,200,000 |  |  |
Unrecognized compensation expense |  |  |  | $ 9,300,000 |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  | 1 year 5 months 19 days |  |  |  |  |
Recognized compensation expense |  |  |  | $ 1,000,000 | $ 1,300,000 | $ 2,200,000 |  |  |
Unrecognized compensation expense |  |  |  | $ 1,300,000 |  |  |  |  |
2012 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  | 9,500,000 | 6,000,000 |
Purchase of common stock (in shares) |  |  |  | 1,769,138 |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  | 2,464,202 |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  | 1,803,165 |  |  |  |  |
2012 Plan | Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  | 2,100,000 |  |  |  |  |
Recognized compensation expense |  |  |  | $ 400,000 |  |  |  |  |
Shares granted in period |  |  |  | 2,400,000 |  |  |  |  |
Performance measurement period |  |  |  | 25 days |  |  |  |  |
Target stock price for full vesting (in dollars per share) |  |  |  | $ 20.00 |  |  |  |  |
Percent of RSUs converting into shares following performance shares |  |  |  | 50.00% |  |  |  |  |
RSUs converting into shares following performance period, conversion ratio |  |  |  | 1 |  |  |  |  |
Performance units, percentage of RSUs vesting pending participants' continued employment |  |  |  | 50.00% |  |  |  |  |
Vesting pending participants' continued employment, required employment period |  |  |  | 1 year |  |  |  |  |
Average stock price, measurement period |  |  |  | 20 days |  |  |  |  |
RSUs aggregate fair value |  |  |  | $ 4,200,000 |  |  |  |  |
2012 Plan | Performance Shares | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance units, threshold for partial vesting (in dollars per share) |  |  |  | $ 16.00 |  |  |  |  |
Vesting percentage if stock price underperforms benchmark |  |  |  | 25.00% |  |  |  |  |
Vesting percentage if stock price exceeds benchmark |  |  |  | 50.00% |  |  |  |  |
2012 Plan | Performance Shares | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Performance units, threshold for partial vesting (in dollars per share) |  |  |  | $ 20.00 |  |  |  |  |
Vesting percentage if stock price underperforms benchmark |  |  |  | 50.00% |  |  |  |  |
Vesting percentage if stock price exceeds benchmark |  |  |  | 100.00% |  |  |  |  |
2012 Plan | Performance Shares | Chief Financial Officer | Former Chief Financial Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted in period |  |  |  | 300,000 |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 1,076,728 |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  | 521,315 |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  | 1,500,000 | 1,000,000 |
Purchase of common stock (in shares) |  |  |  | 553,856 |  |  |  |  |

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