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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands								3 Months Ended
	Mar. 26, 2018	Mar. 20, 2018	Mar. 12, 2018	Sep. 06, 2017	Oct. 01, 2016	Nov. 16, 2015	Aug. 01, 2015	Mar. 31, 2018	Mar. 31, 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								$ 1,678	$ 1,276
Payment of principal and accrued interest of long-term debt								67,107	1,798
Share-based compensation expense								6,648	6,854
Terrence Schulke consulting agreement payment					$ 23			8
DAB Management Group Inc. [Member]
Related Party Transaction [Line Items]
Consulting service fee payable							$ 20	60	60
Michael Brauser, Chairman of the Board [Member]
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
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
Shares accelerated								2,500,000
Another Investor [Member]
Related Party Transaction [Line Items]
Promissory notes											1,000
Principal and accrued interest of long-term debt										1,115
Cash paid for interest									107
Payment of principal and accrued interest of long-term debt	1,143
Marlin Capital Investments, LLC [Member]
Related Party Transaction [Line Items]
Number of common stock shares to be received by RSU holder								2,000,000
Frost Gamma Investments Trust [Member]
Related Party Transaction [Line Items]
Promissory notes											$ 5,000
Principal and accrued interest of long-term debt										$ 5,574
Cash paid for interest									533
Payment of principal and accrued interest of long-term debt	$ 5,713
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Aircraft lease fee								$ 29	0
Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member]
Related Party Transaction [Line Items]
Accelerated share-based compensation expense								$ 6,468
Shares accelerated			2,500,000
Number of units, Granted						5,000,000
Award vesting period						4 years
Restricted Stock Units [Member] | Marlin Capital Investments, LLC [Member]
Related Party Transaction [Line Items]
Shares vested beginning date								Oct. 13, 2015
Share-based compensation expense (Benefit)								$ (1,792)	$ 311
Restricted share units, vested			500,000
Accelerated share-based compensation expense								$ 906
Shares accelerated			500,000
Restricted Stock Units [Member] | T S S Consulting L L C
Related Party Transaction [Line Items]
Share-based compensation expense		$ 2
Number of units, Granted		60,000
Award vesting period		3 years

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