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Related party transactions - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended
	Mar. 26, 2018	Mar. 12, 2018	Sep. 06, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 08, 2015
Related Party Transaction [Line Items]
Promissory notes, interest rate						10.00%
Promissory notes						$ 10,000
Cash paid for interest				$ 1,402	$ 1,678
Payment of principal and accrued interest of long-term debt				875	67,107
Share-based compensation expense				2,275	6,648
Share-based compensation expense				$ 2,275	22,361
Michael Brauser, Chairman of the Board
Related Party Transaction [Line Items]
Promissory notes						4,000
Cash paid for interest					426
Payment of principal and accrued interest of long-term debt	$ 4,570
Consultancy services agreement period			4 years
Share-based compensation expense					$ 302
Shares accelerated (in shares)					2,500,000
Share-based compensation expense					$ 6,468
Another Investor
Related Party Transaction [Line Items]
Promissory notes						1,000
Cash paid for interest					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 (in shares)				2,000,000
Frost Gamma Investments Trust
Related Party Transaction [Line Items]
Promissory notes						$ 5,000
Cash paid for interest					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]
Shares accelerated (in shares)		2,500,000
Restricted Stock Units | Marlin Capital Investments, LLC
Related Party Transaction [Line Items]
Share-based compensation expense (Benefit)					$ 1,792
Restricted share units, vested (in shares)					500,000
Accelerated share-based compensation expense					$ 906
Shares accelerated (in shares)		500,000

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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