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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2018 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) | Sep. 30, 2015 shares | Sep. 30, 2016 shares | 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 | $ |  | $ 25,500 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  | 2 years 9 months 18 days |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 3,032,660 |  |  |  |  | 2,806,364 |  |
Recognized compensation expense | $ |  | $ 2,670 | $ 1,889 |  |  |  |  |  |
Total intrinsic value of options exercised | $ |  | $ 800 | 400 |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ / shares |  | $ 4.35 |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding | $ |  | $ 16,700 |  |  |  |  | $ 8,700 |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 |  |
IDchecker |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Business combination, paid earnout shares issued (in shares) |  |  |  | 137,306 | 81,182 |  |  |  |
Earnout shares | IDchecker |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  |  | 400 |  |  |  |  |  |
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 9 months 18 days |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,949,147 |  |  |  |  | 2,580,176 |  |
Recognized compensation expense | $ |  | $ 2,000 | 1,200 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards | $ |  | $ 19,000 |  |  |  |  |  |  |
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 4 months 24 days |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 200 | 300 |  |  |  |  |  |
Unrecognized compensation expense related to outstanding stock options | $ |  | 2,900 |  |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 1,400 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  | 1 year 8 months 12 days |  |  |  |  |  |  |
Performance Options | Chief Executive Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 2,300 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  | 2 years 9 months 18 days |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) | 800,000 |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 100 |  |  |  |  |  |  |
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) |  | 1,887,915 |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 433,201 |  |  |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,437,539 |  |  |  |  |  |  |
2012 Plan | Performance RSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,017,817 |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 200 | $ 400 |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 972,566 |  |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  | 939,249 |  |  |  |  |  | 1,000,000 |
Shares outstanding under ESPP (in shares) |  | 60,751 |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 79 |  |  |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 366,701 |  |  |  |  |  |  |
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) |  | 416,868 |  |  |  |  |  |  |
Minimum | ESPP |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Discount rate from market price, offering date |  | 15.00% |  |  |  |  |  |  |
Discount rate from market price, purchase date |  | 0.15 |  |  |  |  |  |  |

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