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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2017 | Jun. 17, 2015 | Jan. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Mar. 09, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  |  | $ 11,200 |  | $ 11,200 |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  |  | 2 years 4 months 24 days |  |  |  |
Purchase of common stock (in shares) |  |  |  | 3,080,382 |  | 3,080,382 |  |  | 3,015,374 |
Recognized compensation expense |  |  |  | $ 1,223 | $ 1,172 | $ 2,308 | $ 2,161 |  |  |
Total intrinsic value of options exercised |  |  |  |  |  | $ 32 | 300 |  |  |
Weighted average fair value of options granted (in dollars per share) |  |  |  |  |  | $ 3.98 |  |  |  |
Aggregate intrinsic value of options outstanding |  |  |  | 10,000 | 11,900 | $ 10,000 | 11,900 |  |  |
Percentage of earnout shares vest and eligible for resale (as a percent) |  |  |  |  |  | 12.50% |  |  |  |
Percentage of remaining earnout shares vest and eligible for resale (as a percent) |  |  |  |  |  | 87.50% |  |  |  |
Earnout shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | 74 | 74 | $ 147 | 147 |  |  |
Common stock trading period (in days) |  |  |  |  |  | 10 days |  |  |  |
IDchecker |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued during acquisition (in shares) |  | 712,790 |  |  |  |  |  |  |  |
Business combination, paid earnout shares issued (in shares) |  |  | 137,306 |  |  |  |  | 137,306 | 55,297 |
IDchecker | Closing shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | 300 | 300 | $ 600 | 600 |  |  |
Unrecognized compensation expense |  |  |  | $ 600 |  | $ 600 |  |  |  |
Common stock issued during acquisition (in shares) |  | 712,790 |  |  |  |  |  |  |  |
Vesting period of shares received (in months) |  | 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 10 months 24 days |  |  |  |
RSUs outstanding (in shares) |  |  |  | 2,356,115 |  | 2,356,115 |  |  | 2,046,169 |
Recognized compensation expense |  |  |  | $ 900 | 900 | $ 1,800 | 1,400 |  |  |
Unrecognized compensation expense |  |  |  | 9,400 |  | $ 9,400 |  |  |  |
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 10 months 24 days |  |  |  |
Recognized compensation expense |  |  |  | 200 | $ 300 | $ 500 | $ 800 |  |  |
Unrecognized compensation expense |  |  |  | $ 1,800 |  | $ 1,800 |  |  |  |
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) |  |  |  | 1,981,654 |  | 1,981,654 |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  | 3,421,185 |  | 3,421,185 |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  |  |  | 1,812,730 |  | 1,812,730 |  |  |  |
2012 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  |  |  | 1,300,000 |  | 1,300,000 |  |  |  |
Recognized compensation expense |  |  |  | $ 30 |  | $ 30 |  |  |  |
Senior executive long-term incentive restricted stock units granted (in shares) | 1,300,000 |  |  |  |  |  |  |  |  |
Performance measurement period (in days) | 25 days |  |  |  |  |  |  |  |  |
Target stock price for full vesting (in dollars per share) |  |  |  | $ 20.00 |  | $ 20.00 |  |  |  |
Percent of RSUs converting into unrestricted shares (as a percent) | 50.00% |  |  |  |  |  |  |  |  |
RSU conversion ratio | 1 |  |  |  |  |  |  |  |  |
Percent of RSUs vesting pending continued employment (as a percent) | 50.00% |  |  |  |  |  |  |  |  |
RSUs vesting pending participants' continued employment, required employment period (in years) | 1 year |  |  |  |  |  |  |  |  |
Fair value assumptions, average stock price, measurement period (in days) |  |  |  |  |  | 20 days |  |  |  |
Aggregate fair value estimate of senior executive performance RSUs |  |  |  | $ 1,700 |  | $ 1,700 |  |  |  |
2012 Plan | Performance RSUs | 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 Russell 2000 index (as a percent) | 25.00% |  |  |  |  |  |  |  |  |
Vesting percentage if stock price outperforms Russell 2000 index (as a percent) | 50.00% |  |  |  |  |  |  |  |  |
2012 Plan | Performance RSUs | 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 Russell 2000 index (as a percent) | 50.00% |  |  |  |  |  |  |  |  |
Vesting percentage if stock price outperforms Russell 2000 index (as a percent) | 100.00% |  |  |  |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 1,098,728 |  | 1,098,728 |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  | 531,786 |  | 531,786 |  |  |  |
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) |  |  |  | 543,385 |  | 543,385 |  |  |  |

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