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Share-based compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2018 USD ($) shares | Dec. 08, 2015 shares | Nov. 16, 2015 shares | Nov. 16, 2015 USD ($) shares | Jan. 31, 2018 shares | Dec. 31, 2017 shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2018 shares | Dec. 31, 2018 USD ($) plan $ / shares shares | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 14,681 | $ 31,125
Closing stock market price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 3.6 |
Compensation cost recognized | $ |  |  |  |  |  |  |  |  | $ 30,393 | 33,996
Unrecognized share-based compensation cost in respect of granted share options | $ |  |  |  |  |  |  |  |  | 7,418 |
General and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation cost recognized | $ |  |  |  |  |  |  |  |  | 5,739 | 28,448
Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual base salary | $ |  |  |  | $ 25 |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) |  |  |  |  |  |  | 2,500,000 |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  | 302 | 1,742
Compensation cost recognized | $ |  |  |  |  |  |  | $ 6,468 |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock units, compensation cost | $ |  |  |  |  |  |  |  |  | $ 15,104 | $ 35,169
Unrecognized share-based compensation weighted average period |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |
Restricted Stock Units | Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, issued (in shares) |  |  |  |  | 1,250,000 | 1,250,000 |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) | 2,500,000 |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense | $ |  |  |  |  |  |  | $ 6,468 |  |  |
Restricted Stock Units | Stockholder Approval | Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon exercise of restricted stock unit (in shares) |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restricted stock units outstanding (in shares) |  |  |  |  |  |  |  |  | 150,000 |
Employee Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) |  |  |  |  |  |  |  | 47,500 |  |
Number of share options, exercised (in shares) |  |  |  |  |  |  |  |  |  | 0
Fair value of option vested | $ |  |  |  |  |  |  |  |  | $ 159 | $ 125
Compensation cost recognized | $ |  |  |  |  |  |  |  |  | $ 243 | $ 123
Marlin Capital Investments, LLC | Michael Brauser Managing |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage by Mike Brauser in Marlin Capital Investments LLC |  |  |  |  |  |  |  |  | 50.00% |
Marlin Capital Investments, LLC | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restricted stock units outstanding (in shares) |  |  |  |  |  |  |  |  | 2,000,000 |
Restricted share units, vested (in shares) | 500,000 |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) |  |  |  |  |  |  | 500,000 |  |  |
Accelerated share-based compensation expense | $ |  |  |  |  |  |  | $ 906 |  |  |
Frost Gamma | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, issued (in shares) |  |  |  |  |  |  | 3,000,000 |  |  |
Restricted share units, granted (in shares) |  | 3,000,000 |  |  |  |  |  |  |  |
2015 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of share-based incentive plans | plan |  |  |  |  |  |  |  |  | 3 |
Number of shares of common stock authorized for issuance |  |  |  |  |  |  |  |  | 21,152,558 |
Common stock reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 156,490 |
2018 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 7,652,558 |
The Acceleration |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense | $ | $ 15,548 |  |  |  |  |  |  |  |  |
The Acceleration | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) | 4,960,498 |  |  |  |  |  |  |  |  |
The Acceleration | Restricted Stock Units | Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) | 2,500,000 |  |  |  |  |  |  |  |  |
The Acceleration | Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) | 150,000 |  |  |  |  |  |  |  |  |
The Acceleration | Employee Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) | 47,500 |  |  |  |  |  |  |  |  |
Spin Off Grants | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, vested (in shares) |  |  |  |  |  |  |  | 2,041,000 |  |
Award vesting period |  |  |  |  |  |  |  | 3 years |  |
Restricted share units, granted (in shares) |  |  |  |  |  |  |  | 304,000 |  |
Spin Off Grants | Stock Compensation Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  | $ 881 |  |  |
Transaction Grants | Stock Compensation Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, vested (in shares) |  |  |  |  |  |  | 2,041,000 |  |  |
Award requisite service period |  |  |  |  |  |  | 3 years |  |  |
Compensation cost recognized | $ |  |  |  |  |  |  | $ 5,409 |  |  |

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