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Share-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2018 | Sep. 06, 2017 | Dec. 08, 2015 | Nov. 16, 2015 | Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 03, 2016 | Jun. 02, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 33,996 | $ 29,249 | $ 34,160 |  |
Closing stock market price |  |  |  |  |  | $ 4.40 |  |  |  |
Share options, granted |  |  |  |  |  | 0 |  |  |  |
Compensation cost recognized |  |  |  |  |  | $ 33,996 | 29,249 | 34,616 |  |
Unrecognized share-based compensation cost in respect of granted share options |  |  |  |  |  | 243 |  |  |  |
General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  | 31,123 | 26,909 | 33,850 |  |
Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Annual base salary |  |  |  | $ 25 |  |  |  |  |  |
Consulting services agreement effective date |  | Jun. 23, 2017 |  |  |  |  |  |  |  |
Business consulting services agreement period |  | 4 years |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  | 1,742 |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost in respect of granted share options |  |  |  |  |  | $ 34,878 |  |  |  |
Unrecognized share-based compensation weighted average period |  |  |  |  |  | 1 year 4 months 24 days |  |  |  |
Restricted stock units, compensation cost |  |  |  |  |  | $ 35,169 | $ 30,127 | $ 34,505 |  |
Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |  |  |  |
RSU vesting condition |  |  |  |  |  | no portion of the RSUs shall vest unless and until the Company has gross revenue in excess of $100.0 million and positive EBITDA in any one fiscal year during the vesting period (the “Vesting Conditions”). |  |  |  |
Restricted share units, vested |  |  |  |  |  | 2,500,000 |  |  |  |
Restricted share units, issued |  |  |  |  |  | 1,250,000 |  |  |  |
Restricted Stock Units [Member] | Stockholder Approval [Member] | Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issuable upon exercise of restricted stock unit |  |  |  | 5,000,000 |  |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share options, granted |  |  |  |  |  | 0 |  |  |  |
Weighted average grant date fair value of share options granted |  |  |  |  |  |  | $ 3.55 | $ 7.35 |  |
Number of share option, exercised |  |  |  |  |  | 0 | 0 | 0 |  |
Fair value of option vested |  |  |  |  |  | $ 125 | $ 272 | $ 61 |  |
Compensation cost recognized |  |  |  |  |  | $ 123 | 110 | 28 |  |
Unrecognized share-based compensation weighted average period |  |  |  |  |  | 2 years |  |  |  |
Subsequent Event [Member] | Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, issued |  |  |  |  | 1,250,000 |  |  |  |  |
Marlin Capital Investments, LLC [Member] | 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 [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restricted stock units outstanding |  |  |  |  |  | 2,000,000 |  |  |  |
Shares vested beginning date |  |  |  |  |  | Oct. 13, 2015 |  |  |  |
Share-based compensation description |  |  |  |  |  | These RSUs vest annually beginning from October 13, 2015 only if certain performance goals of the Company are met. The shares underlying such RSUs will not be delivered until October 13, 2018, unless there is a change of control of the Company, termination of the agreement by the Company without cause, or termination of the agreement by Marlin Capital for good reason. |  |  |  |
Restricted share units, vested |  |  |  |  |  | 1,500,000 |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 4,272 | $ 1,252 | 1,512 |  |
Marlin Capital Investments, LLC [Member] | Subsequent Event [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted share units, vested | 500,000 |  |  |  |  |  |  |  |  |
Frost Gamma [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 25,350 |  |
Restricted share units, granted |  |  | 3,000,000 |  |  |  |  |  |  |
Third-party vendors [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common shares to vendors for services rendered, shares |  |  |  |  |  | 0 | 14,500 | 45,000 |  |
Third-party vendors [Member] | Restricted Stock Units [Member] | General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock compensation expenses |  |  |  |  |  | $ 0 | $ 166 | $ 446 |  |
2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares of common stock authorized for issuance |  | 13,500,000 |  |  |  |  |  |  | 12,500,000 | 2,500,000
Common stock reserved for future issuance |  |  |  |  |  | 4,384,240 |  |  |  |
2008 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  | 310,568 |  |  |  |

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