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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2018 | Mar. 12, 2018 | Sep. 06, 2017 | Aug. 01, 2015 | Oct. 14, 2014 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | 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 |
Cash paid for interest |  |  |  |  |  |  |  |  |  | $ 4,931 | $ 4,940 |  |
Payment of principal and accrued interest of long-term debt |  |  |  |  |  |  |  |  |  | 72,229 | 3,472 |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  | 11,855 | 25,456 |  |
Share-based compensation expense |  |  |  |  |  | $ 2,593 |  | $ 11,071 |  | 27,568 | 27,702 |  |
DAB Management Group Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consulting service fees payable |  |  |  | $ 20 |  | 0 |  | 60 |  | 60 | 180 |  |
Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  |  |  | $ 6,468 |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | 4,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  |  |  |  |  | 4,460 |
Cash paid for interest |  |  |  |  |  |  |  | 426 | $ 426 |  | 426 |  |
Payment of principal and accrued interest of long-term debt | $ 4,570 |  |  |  |  |  |  |  |  |  |  |  |
Business consulting services agreement period |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Consulting services agreement effective date |  |  | Jun. 23, 2017 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | 302 |  |  |  | $ 302 |  |  |
Shares accelerated |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 6,468 |  |  |  |  |  |
Another Investor |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | 1,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  |  |  |  |  | 1,115 |
Cash paid for interest |  |  |  |  |  |  |  | 107 | 107 |  | 107 |  |
Payment of principal and accrued interest of long-term debt | 1,143 |  |  |  |  |  |  |  |  |  |  |  |
Marlin Capital Investments, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares to be received by RSU holder |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
Frost Gamma Investments Trust |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Principal and accrued interest of long-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 5,574 |
Cash paid for interest |  |  |  |  |  |  |  | 533 | $ 533 |  | 533 |  |
Payment of principal and accrued interest of long-term debt | $ 5,713 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units | Michael Brauser, Chairman of the Board |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  |  |  | 6,468 |  |  |  |  |  |
Shares accelerated |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units | Marlin Capital Investments, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vested beginning date |  |  |  |  | Oct. 13, 2015 |  |  |  |  | Oct. 13, 2015 |  |  |
Share-based compensation expense (Benefit) |  |  |  |  |  | $ 1,792 |  | $ (315) |  | $ 1,792 | $ (934) |  |
Restricted share units, vested |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  |  |  | $ 906 |  |  |  |  |  |
Shares accelerated |  |  |  |  |  |  | 500,000 |  |  |  |  |  |

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