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Share-based payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 06, 2017 | Mar. 14, 2017 | Dec. 08, 2015 | Nov. 16, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Jun. 03, 2016 | Jun. 02, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 27,702 | $ 21,941 |  |  |
Closing stock market price |  |  |  |  |  | $ 4.90 |  | $ 4.90 |  |  |  |
Compensation cost recognized |  |  |  |  |  | $ 11,071 | $ 7,318 | $ 27,702 | 21,941 |  |  |
Unrecognized share-based compensation cost in respect of granted share options |  |  |  |  |  | 274 |  | 274 |  |  |  |
General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  | 10,209 | 6,661 | $ 25,274 | 20,163 |  |  |
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 |  |  |  |  |  |  |  |  |  |
Michael Brauser Managing Member [Member] | Marlin Capital Investments, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by Mike Brauser in Marlin Capital Investments LLC |  |  |  |  |  |  |  | 50.00% |  |  |  |
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 not delivered |  |  | 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] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation weighted average period |  |  |  |  |  |  |  | 2 years 2 months 12 days |  |  |  |
Employee Stock Option [Member] | General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost recognized |  |  |  |  |  | $ 31 | 35 | $ 91 | 82 |  |  |
Restricted Stock Units and Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock units and restricted stock outstanding |  |  |  |  |  | 10,756,472 |  | 10,756,472 |  | 12,407,029 |  |
Restricted share units, vested not delivered |  |  |  |  |  |  |  | 2,357,852 |  |  |  |
Restricted share units and restricted stock, granted | [1] |  |  |  |  |  |  | 2,732,000 |  |  |  |
Unrecognized share-based compensation weighted average period |  |  |  |  |  |  |  | 1 year 10 months 25 days |  |  |  |
Restricted stock units and restricted stock, compensation cost |  |  |  |  |  | $ 11,461 | 7,615 | $ 28,613 | 22,561 |  |  |
Unrecognized share-based compensation costs in respect of granted restricted share units and restricted stock |  |  |  |  |  | $ 59,625 |  | $ 59,625 |  |  |  |
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 and restricted stock outstanding |  |  |  |  |  | 2,000,000 |  | 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. |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 315 | 315 | $ 937 | 937 |  |  |
Frost Gamma [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted share units and restricted stock, granted |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
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 | $ 37 | $ 0 | $ 166 |  |  |
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 |  |  |  |  |  | 3,838,658 |  | 3,838,658 |  |  |  |
Increase in shares of common stock authorized and included in future issuance |  | 1,000,000 |  |  |  |  |  |  |  |  |  |
2008 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  | 180,568 |  | 180,568 |  |  |  |
[1] | 650,000 shares of restricted stock were granted during the nine months ended September 30, 2017, and 150,000 shares of restricted stock were unvested as of September 30, 2017.

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