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Stockholders' Equity - Additional Information (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2018 $ / shares shares | Jun. 17, 2015 shares | Dec. 31, 2016 | Sep. 30, 2015 shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 shares | Feb. 28, 2019 | 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 | $ |  |  |  |  | $ 16,600,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 3 months 18 days |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  |  | 1,686,902 | 2,806,364 | 2,845,866 | 3,015,374 |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 9,637,000 | $ 8,950,000 | $ 5,478,000 |  |  |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  | $ 11,100,000 | $ 1,400,000 | $ 1,400,000 |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 5.07 | $ 4.56 | $ 4.28 |  |  |  |  |
Aggregate intrinsic value of options | $ |  |  |  |  | $ 4,900,000 | $ 8,700,000 |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  | $ 0.001 |  |
Percentage of common stock outstanding for acquiring person under right agreement |  |  |  |  |  |  |  |  | 4.90% |  |  |
Series B Junior Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred share purchase right for each share of common stock (in shares) |  |  |  |  |  |  |  |  |  | 1 |  |
Preferred stock, share conversion ratio |  |  |  |  |  |  |  |  |  | 0.001000 |  |
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 |  |
ID Checker | Closing Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 0 | $ 0 | $ 1,200,000 |  |  |  |  |
Vesting service period of shares received |  | 27 months |  |  |  |  |  |  |  |  |  |
Common stock issued during acquisition (in shares) |  | 712,790 |  |  |  |  |  |  |  |  |  |
ID Checker | ID Checker earnout shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 0 | $ 400,000 | $ 400,000 |  |  |  |  |
Earnout shares issued (in shares) |  |  |  | 137,306 |  |  |  | 81,182 |  |  |  |
Common stock trading period |  |  | 10 days |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 3 years |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 3 months 18 days |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 2,352,487 | 2,580,176 | 2,357,021 | 2,046,169 |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 6,800,000 | $ 5,900,000 | $ 4,000,000.0 |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | $ 12,200,000 |  |  |  |  |  |  |
Senior Executive Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 1 year 1 month 6 days |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 1,722,551 |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 1,000,000.0 | 1,500,000 |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | 600,000 |  |  |  |  |  |  |
Performance Options | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) | 800,000 |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 700,000 |  |  |  |  |  |  |
Exercise price per share (in dollars per share) | $ / shares | $ 9.50 |  |  |  |  |  |  |  |  |  |  |
Vesting service period of shares received | 3 years |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  | 1,171,708 |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  |  | 807,144 |  |  |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 1,890,879 |  |  |  |  |  |  |
2012 Plan | Senior Executive Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 1,722,551 |  |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  |  | 298,015 |  |  |  |  |  |  |
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) |  |  |  |  | 799,086 |  |  |  |  |  |  |
Shares issued under the plan (in shares) |  |  |  |  | 200,914 |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 400,000 |  |  |  |  |  |  |
ESPP | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Discount rate from market price purchase date |  |  |  |  | 0.15 |  |  |  |  |  |  |
ESPP | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Discount rate from market price offering date |  |  |  |  | 15.00% |  |  |  |  |  |  |
ESPP | Stock options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 700,000 | $ 1,400,000 | $ 1,000,000.0 |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  |  |  |  | 391,701 |  |  |  |  |  |  |
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) |  |  |  |  | 366,870 |  |  |  |  |  |  |

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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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