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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Jul. 31, 2013 | Jun. 30, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Feb. 19, 2014 | Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, shares sold |  |  |  | 32,781,704 | 31,721,114 |  |  |
Number of warrants outstanding |  |  |  |  |  | 6,667 |  |
Common stock issued exercise price |  |  |  |  |  | $ 0.91 |  |
Warrants expired date |  |  |  |  |  | 2014-12 |  |
Estimated average forfeiture rate |  |  |  | 12.10% |  |  |  |
Tax benefits received related to stock option exercises |  |  |  | $ 0 | $ 0 | $ 0 |  |
Recognized compensation expense |  |  |  | 5,582,000 | 3,760,000 | 3,444,000 |  |
Unrecognized compensation expense |  |  |  | 2,000,000 |  |  |  |
Total intrinsic value of options exercised |  |  |  | $ 3,300,000 | $ 600,000 | $ 500,000 |  |
Weighted average fair value of options granted |  |  |  | $ 3.29 | $ 2.83 |  |  |
Number of options granted to employees |  |  |  | 98,500 | 1,927,500 | 0 |  |
Purchase of common stock |  |  |  | 3,015,374 | 3,647,705 | 2,334,326 |  | 2,824,964
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 |  |  |  | $ 300,000 | $ 47,000 |  |  |
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 |  |  |  |
IDchecker [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Business combination, earnout shares | $ 2,000,000 |  |  | $ 2,000,000 |  |  |  |
IDchecker [Member] | Maximum [Member] | 1/1/15-9/30/15 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Business combination, earnout shares |  |  |  | 1,000,000 |  |  |  |
IDchecker [Member] | Maximum [Member] | 10/1/15-9/30/16 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Business combination, earnout shares |  |  |  | 1,000,000 |  |  |  |
IDchecker [Member] | Closing Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | 1,300,000 | 300,000 |  |  |
Vesting period of shares received | 27 months |  |  |  |  |  |  |
Common stock issued during acquisition, share | 712,790 |  |  |  |  |  |  |
Unrecognized compensation expense |  |  |  | $ 1,200,000 |  |  |  |
2012 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  | 4,000,000 |
Purchase of common stock |  |  |  | 1,916,646 |  |  |  |
Number of common stock reserved for future grants |  |  |  | 2,040,378 |  |  |  |
Scenario, Previously Reported [Member] | 2012 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  | 2,000,000 |
Stock options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 1,300,000 | 2,200,000 | $ 2,200,000 |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  | 2 years 3 months 18 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 2,700,000 | $ 1,200,000 | $ 1,300,000 |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  | 2 years 8 months 12 days |  |  |  |
Common stock reserved for issuance |  |  |  | 1,000,000 |  |  |  |
Options outstanding |  |  |  | 2,046,169 | 802,917 | 1,101,303 |  | 692,504
Vesting period of shares received |  |  |  | 4 years |  |  |  |
Unrecognized compensation expense |  |  |  | $ 6,300,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | 2012 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options outstanding |  |  |  | 1,401,169 |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, shares sold |  |  | 2,857,142 |  |  |  |  |
Common stock, price per share |  |  | $ 5.25 |  |  |  |  |
Net proceeds from issuance of common stock |  |  | $ 13,900,000 |  |  |  |  |
Underwriting discounts and commissions and other offering expenses |  |  | $ 1,100,000 |  |  |  |  |
Other offering expenses |  | $ 100,000 |  |  |  |  |  |
Overallotment option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Additional shares of common stock to cover over allotments |  |  | 428,571 |  |  |  |  |
Underwriter option exercised |  | $ 2,100,000 |  |  |  |  |  |

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