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Stock-Based Compensation - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) Tranche $ / shares shares | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Excess tax benefits related to windfalls |  | $ 11,600,000
Number of restricted stock units issued | shares | 544,105 |
Weighted average grant date fair value of the stock options granted | $ / shares | $ 0.93 |
Number of equal tranches | Tranche | 4 |
Vest in Four Equal Tranches |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate number of shares granted to awards, share-based compensation arrangements | shares | 1,508,159 |
Vest Over Four Year Period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate number of shares granted to awards, share-based compensation arrangements | shares | 642,378 |
Tranche One |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to options | $ 700,000 |
Tranche achievement date | 2017-12 |
Tranche Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, share-based compensation arrangements | $ 0 |
Tranche Three |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, share-based compensation arrangements | 0 |
Tranche Four |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, share-based compensation arrangements | $ 0 |
Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted average grant date fair value of the stock options granted | $ / shares | $ 1.31 |
Aggregate number of shares granted to awards, share-based compensation arrangements | shares | 2,150,537 |
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
Unrecognized compensation expense related to options | $ 4,400,000 |
Stock Options | Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of stock granted, share-based compensation arrangements | 2,000,000 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of Restricted stock options granted , value | $ 600,000 |
Weighted average grant date fair value of the stock options granted | $ / shares | $ 1.10 |
Unrecognized compensation expense related to non-option | $ 4,200,000 |
Options vest over vesting period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to options | $ 3,900,000 |

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