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STOCKHOLDERS' EQUITY - ADDITIONAL INFORMATION (Details) |  | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jun. 17, 2015 shares | Dec. 31, 2017 | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2015 shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Oct. 23, 2018 $ / right $ / shares shares | Mar. 07, 2018 shares | Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 14,700,000 |  | $ 14,700,000 |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 2 years 3 months 18 days |  |  |  |  |
Purchase of common stock (in shares) |  |  | 2,806,364 | 3,647,705 | 2,806,364 | 2,845,866 | 3,015,374 |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 8,950,000 | $ 5,478,000 | $ 4,079,000 |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  | $ 1,400,000 | $ 1,400,000 | $ 3,300,000 |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 4.56 | $ 4.28 | $ 3.29 |  |  |
Aggregate intrinsic value of options | $ |  |  | $ 8,700,000 |  | $ 8,700,000 | $ 15,600,000 |  |  |  |
Excess tax benefit on stock option exercises | $ |  |  |  |  |  | $ 0 | $ 0 |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |
Earnout Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 400,000 | $ 400,000 | $ 300,000 |  |  |
Common stock trading period |  | 10 days |  |  |  |  |  |  |  |
Series B Junior Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, share conversion ratio |  |  |  |  |  |  |  | 0.001 |  |
Number of preferred share purchase right for each share of common stock (in shares) |  |  |  |  |  |  |  | 1 |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |
Preferred stock, purchase price per right (in dollars per right) | $ / right |  |  |  |  |  |  |  | 35.00 |  |
Preferred stock, redemption price per right (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |
IDchecker |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Earnout shares issued (in shares) |  |  |  | 137,306 |  |  | 81,182 |  |  |
IDchecker | Closing Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 0 | $ 1,200,000 | $ 1,200,000 |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |  |  |  |  |  |
Vesting period of shares received | 27 months |  |  |  |  |  |  |  |  |
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 3 months 18 days |  |  |  |  |
Options outstanding (in shares) |  |  | 2,580,176 | 802,917 | 2,580,176 | 2,357,021 | 2,046,169 |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 5,900,000 | $ 4,000,000.0 | $ 2,700,000 |  |  |
Unrecognized compensation expense | $ |  |  | $ 11,700,000 |  | $ 11,700,000 |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |
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 1 month 6 days |  |  |  |  |
Options outstanding (in shares) |  |  | 2,042,817 |  | 2,042,817 |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 1,500,000 | 400,000 |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 1,900,000 |  | $ 1,900,000 |  |  |  |  |
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) |  |  |  |  | 2 years 6 months |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 1,000,000.0 |  | $ 1,000,000.0 |  |  |  |  |
2012 Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 9,500,000
Purchase of common stock (in shares) |  |  | 1,776,798 |  | 1,776,798 |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  | 2,745,093 |  | 2,745,093 |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  | 2,137,338 |  | 2,137,338 |  |  |  |  |
2012 Plan | Performance Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  | 2,042,817 |  | 2,042,817 |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  | 1,029,566 |  | 1,029,566 |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |
Number of common stock reserved for future grants (in shares) |  |  | 939,249 |  | 939,249 |  |  |  |  |
Shares issued under the plan (in shares) |  |  | 60,751 |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 200,000 |  |  |  |  |
ESPP | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Discount rate from market price offering date |  |  |  |  | 15.00% |  |  |  |  |
Discount rate from market price purchase date |  |  |  |  | 0.15 |  |  |  |  |
ESPP | Stock options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 1,400,000 | $ 1,000,000.0 | $ 1,300,000 |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  | 445,733 |  | 445,733 |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 1,500,000
Purchase of common stock (in shares) |  |  | 442,838 |  | 442,838 |  |  |  |  |

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