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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2015 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2015 | Sep. 30, 2015 | Mar. 07, 2018 | Sep. 30, 2017 | Mar. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  | $ 19,400,000 |  |  | $ 19,400,000 |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 2 years 5 months 9 days |  |  |  |  |  |
Purchase of common stock (in shares) |  | 3,046,505 |  |  | 3,046,505 |  |  |  |  | 2,845,866 |
Recognized compensation expense |  | $ 2,058,000 |  | $ 1,223,000 | $ 3,947,000 | $ 2,308,000 |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  | $ 500,000 | 32,000 |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) |  |  |  |  | $ 4.56 |  |  |  |  |  |
Aggregate intrinsic value of options outstanding |  | 10,200,000 |  |  | $ 10,200,000 |  |  |  |  | $ 15,600,000 |
IDchecker |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, paid earnout shares issued (in shares) |  |  |  |  |  |  | 137,306 | 81,182 |  |  |
Closing shares | IDchecker |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | 300,000 | 0 | 600,000 |  |  |  |  |
Common stock issued during acquisition (in shares) | 712,790 |  |  |  |  |  |  |  |  |  |
Vesting period of shares received (in months) | 27 months |  |  |  |  |  |  |  |  |  |
Earnout shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  | $ 0 |  | 100,000 | $ 400,000 | 100,000 |  |  |  |  |
Common stock trading period (in days) |  |  | 10 days |  |  |  |  |  |  |  |
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 8 months 27 days |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,670,047 |  |  | 2,670,047 |  |  |  |  | 2,357,021 |
Recognized compensation expense |  | $ 1,400,000 |  | 900,000 | $ 2,600,000 | 1,800,000 |  |  |  |  |
Unrecognized compensation expense |  | 14,300,000 |  |  | 14,300,000 |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense |  | 3,100,000 |  |  | $ 3,100,000 |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  | 2 years 3 months 26 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 (in years) |  |  |  |  | 2 years 3 months 15 days |  |  |  |  |  |
Recognized compensation expense |  | 300,000 |  | 200,000 | $ 600,000 | 500,000 |  |  |  |  |
Unrecognized compensation expense |  | $ 2,000,000 |  |  | $ 2,000,000 |  |  |  |  |  |
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) |  | 1,999,939 |  |  | 1,999,939 |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 1,357,120 |  |  | 1,357,120 |  |  |  |  |  |
2012 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,227,209 |  |  | 2,227,209 |  |  |  |  |  |
2012 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
RSUs outstanding (in shares) |  | 2,100,000 |  |  | 2,100,000 |  |  |  |  | 2,100,000 |
Recognized compensation expense |  | $ 400,000 |  | $ 30,000 | $ 700,000 | $ 300,000 |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 1,046,566 |  |  | 1,046,566 |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |  |
Shares outstanding under ESPP |  | 0 |  |  | 0 |  |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 445,733 |  |  | 445,733 |  |  |  |  |  |
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) |  | 442,838 |  |  | 442,838 |  |  |  |  |  |

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