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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Jan. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2016 | Jan. 27, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 8,400,000 |  | $ 8,400,000 |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 11 months 12 days |  |  |  |
Purchase of common stock |  |  | 3,086,774 | 3,777,993 | 3,086,774 | 3,647,705 | 3,777,993 |  |
Recognized compensation expense |  |  | $ 947,000 | $ 810,000 | $ 3,108,000 |  | $ 2,495,000 |  |
Unrecognized compensation expense |  |  | $ 2,300,000 | $ 3,700,000 | 2,300,000 |  | 3,700,000 |  |
Total intrinsic value of options exercised |  |  |  |  | $ 2,800,000 |  | $ 300,000 |  |
Weighted average fair value of options granted |  |  |  |  | $ 4.51 |  |  |  |
Weighted-average remaining contractual term |  |  |  |  | 6 years 8 months 9 days |  | 7 years 2 months 12 days |  |
Weighted-average exercise price, outstanding shares |  |  | $ 3.94 | $ 3.61 | $ 3.94 | $ 3.70 | $ 3.61 |  |
Aggregate intrinsic value, outstanding shares |  |  | $ 11,500,000 | $ 4,200,000 | $ 11,500,000 |  | $ 4,200,000 |  |
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 [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  | 46,000 |  | $ 200,000 |  |  |  |
Vesting period of shares received |  |  |  |  | 27 months |  |  |  |
Common stock trading period |  |  |  |  | 10 days |  |  |  |
Earnout Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Delivery period of written statement of calculation of revenue and net income for earnout period |  |  |  |  | 75 days |  |  |  |
ID Checker [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Business combination, paid earnout shares issued |  | 137,306 |  |  |  | 137,306 |  |  |
ID Checker [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Business combination, earnout shares | $ 1,000,000 |  |  |  |  |  |  |  |
ID Checker [Member] | Closing Shares [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  | 300,000 |  | $ 900,000 |  |  |  |
Unrecognized compensation expense |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |
Common stock issued during acquisition, share | 712,790 |  |  |  |  |  |  |  |
Vesting period of shares received | 27 months |  |  |  |  |  |  |  |
2012 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  |  |  | 6,000,000
Purchase of common stock |  |  | 1,987,046 |  | 1,987,046 |  |  |  |
Number of common stock reserved for future grants |  |  | 2,139,637 |  | 2,139,637 |  |  |  |
2010 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock |  |  | 1,099,728 |  | 1,099,728 |  |  |  |
Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants |  |  | 130,171 |  | 130,171 |  |  |  |
Scenario, Previously Reported [Member] | 2012 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  |  |  | 4,000,000
Scenario, Forecast [Member] | ID Checker [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Business combination, earnout shares |  |  |  |  |  |  |  | $ 1,000,000 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 10 months 6 days |  | 2 years 4 months 24 days |  |
Common stock reserved for issuance |  |  | 1,000,000 |  | 1,000,000 |  |  |  |
Options outstanding |  |  | 1,933,419 |  | 1,933,419 | 802,917 |  |  |
Recognized compensation expense |  |  | $ 700,000 | 300,000 | $ 2,000,000 |  | $ 900,000 |  |
Restricted Stock Units (RSUs) [Member] | 2012 Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding |  |  | 1,288,419 |  | 1,288,419 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock |  |  | 644,998 |  | 644,998 |  |  |  |
Stock options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 7 months 6 days |  | 2 years 9 months 18 days |  |
Recognized compensation expense |  |  | $ 300,000 | 500,000 | $ 1,100,000 |  | $ 1,600,000 |  |
Restricted stock units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 6,100,000 | $ 2,100,000 | $ 6,100,000 |  | $ 2,100,000 |  |

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