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Stockholders' Equity - Additional Information (Details) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2018 $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Mar. 31, 2017 shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Sep. 30, 2015 shares | Feb. 28, 2019 | Oct. 23, 2018 $ / right $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Mar. 07, 2018 shares | Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 18,800,000 |  |  | $ 18,800,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 1,664,565 |  |  | 1,664,565 |  |  |  |  | 2,806,364 |  |
Discount rate from market price, purchase date |  |  |  |  | 0.15 |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 2,268,000 | $ 1,980,000 |  | $ 7,291,000 | $ 5,927,000 |  |  |  |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  | $ 11,000,000.0 | 1,200,000 |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 5.08 |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding | $ |  | $ 5,400,000 |  |  | $ 5,400,000 |  |  |  |  | $ 12,800,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 |  |
Percentage of common stock outstanding for acquiring person under right agreement |  |  |  |  |  |  |  | 4.90% |  |  |  |
Earnout shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  |  |  | $ 0 | 400,000 |  |  |  |  |  |
Earnout shares | IDchecker |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business combination, paid earnout shares issued (in shares) |  |  |  | 81,182 |  |  | 137,306 |  |  |  |  |
Common stock trading period (in days) |  |  |  |  | 10 days |  |  |  |  |  |  |
Series B 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 |  |  |  |  |  |  |  |  | 0.001 |  |  |
Preferred stock, purchase price per right (in dollars per right) | $ / right |  |  |  |  |  |  |  |  | 35.00 |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |
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 6 months |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,497,671 |  |  | 2,497,671 |  |  |  |  | 2,580,176 |  |
Recognized compensation expense | $ |  | $ 1,600,000 | 1,300,000 |  | $ 5,300,000 | 3,900,000 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards | $ |  | 14,100,000 |  |  | $ 14,100,000 |  |  |  |  |  |  |
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) |  |  |  |  | 3 years 1 month 6 days |  |  |  |  |  |  |
Recognized compensation expense | $ |  | 200,000 | 300,000 |  | $ 500,000 | 900,000 |  |  |  |  |  |
Unrecognized compensation expense related to outstanding stock options | $ |  | 1,900,000 |  |  | 1,900,000 |  |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | 800,000 |  |  | $ 800,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 1 year 2 months 12 days |  |  |  |  |  |  |
Performance Options | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | 1,900,000 |  |  | $ 1,900,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 2 years 4 months 24 days |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) | 800,000 |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 200,000 |  |  | $ 500,000 |  |  |  |  |  |  |
Exercise price per share (in dollars per share) | $ / shares | $ 9.50 |  |  |  |  |  |  |  |  |  |  |
Vesting period of awards | 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) |  | 1,194,371 |  |  | 1,194,371 |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 757,135 |  |  | 757,135 |  |  |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,036,063 |  |  | 2,036,063 |  |  |  |  |  |  |
2012 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 1,703,569 |  |  | 1,703,569 |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 200,000 | $ 400,000 |  | $ 700,000 | $ 1,100,000 |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 298,015 |  |  | 298,015 |  |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  | 871,658 |  |  | 871,658 |  |  |  |  |  | 1,000,000 |
Shares outstanding under ESPP (in shares) |  | 128,342 |  |  | 128,342 |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 100,000 |  |  | $ 300,000 |  |  |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,500,000
Number of common stock reserved for future grants (in shares) |  | 391,701 |  |  | 391,701 |  |  |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 366,870 |  |  | 366,870 |  |  |  |  |  |  |
Minimum | ESPP |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Discount rate from market price, offering date |  |  |  |  | 15.00% |  |  |  |  |  |  |

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