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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2018 | Mar. 12, 2018 | Sep. 06, 2017 | Aug. 01, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 08, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissory notes, interest rate |  |  |  |  |  |  |  |  | 10.00%
Promissory notes |  |  |  |  |  |  |  |  | $ 10,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  | $ 62,963 |
Repayments of long-term debt |  |  |  |  |  |  | $ 76,787 | 4,310 |
Share-based compensation expense |  |  |  |  |  |  | 14,681 | 31,125 |
Share-based compensation expenses |  |  |  |  |  |  | 30,393 | 33,996 |
DAB Management Group Inc. |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Consulting service fee payable |  |  |  | $ 20 |  |  | 60 | 240 |
Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  | 4,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  | 4,460 |
Interest paid |  |  |  |  |  | $ 426 |  | 426 |
Repayments of long-term debt | $ 4,570 |  |  |  |  |  |  |  |
Consultancy services agreement period |  |  | 4 years |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 302 | 1,742 |
Number of shares accelerated and related to share-based compensation expense (in shares) |  |  |  |  | 2,500,000 |  |  |  |
Share-based compensation expenses |  |  |  |  | $ 6,468 |  |  |  |
Michael Brauser, Chairman of the Board | Restricted Stock Units |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  | 6,468 |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) |  | 2,500,000 |  |  |  |  |  |  |
Another Investor |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  | 1,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  | 1,115 |
Interest paid |  |  |  |  |  | 107 |  | 107 |
Repayments of long-term debt | 1,143 |  |  |  |  |  |  |  |
Frost Gamma Investments Trust |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  | $ 5,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  | 5,574 |
Interest paid |  |  |  |  |  | $ 533 |  | 533 |
Repayments of long-term debt | $ 5,713 |  |  |  |  |  |  |  |
Marlin Capital Investments, LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock shares to be received by RSU holder (in shares) |  |  |  |  |  |  | 2,000,000 |  |
Marlin Capital Investments, LLC | Restricted Stock Units |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense (Benefit) |  |  |  |  |  |  | $ 1,792 | $ 4,272 |
Restricted share units, vested (in shares) |  | 500,000 |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  | $ 906 |  |  |  |
Number of shares accelerated and related to share-based compensation expense (in shares) |  |  |  |  | 500,000 |  |  |  |

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