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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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