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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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