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Share-based payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended		9 Months Ended
		Sep. 06, 2017	Mar. 14, 2017	Dec. 08, 2015	Nov. 16, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jun. 03, 2016	Jun. 02, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense								$ 27,702	$ 21,941
Closing stock market price						$ 4.90		$ 4.90
Compensation cost recognized						$ 11,071	$ 7,318	$ 27,702	21,941
Unrecognized share-based compensation cost in respect of granted share options						274		274
General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation cost recognized						10,209	6,661	$ 25,274	20,163
Michael Brauser, Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual base salary					$ 25
Consulting services agreement effective date		Jun. 23, 2017
Business consulting services agreement period		4 years
Michael Brauser Managing Member [Member] | Marlin Capital Investments, LLC [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ownership percentage by Mike Brauser in Marlin Capital Investments LLC								50.00%
Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period					4 years
RSU vesting condition								no portion of the RSUs shall vest unless and until the Company has gross revenue in excess of $100.0 million and positive EBITDA in any one fiscal year during the vesting period (the “Vesting Conditions”).
Restricted share units, vested not delivered			1,250,000
Restricted Stock Units [Member] | Stockholder Approval [Member] | Michael Brauser, Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issuable upon exercise of restricted stock unit					5,000,000
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation weighted average period								2 years 2 months 12 days
Employee Stock Option [Member] | General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation cost recognized						$ 31	35	$ 91	82
Restricted Stock Units and Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units and restricted stock outstanding						10,756,472		10,756,472		12,407,029
Restricted share units, vested not delivered								2,357,852
Restricted share units and restricted stock, granted	[1]							2,732,000
Unrecognized share-based compensation weighted average period								1 year 10 months 25 days
Restricted stock units and restricted stock, compensation cost						$ 11,461	7,615	$ 28,613	22,561
Unrecognized share-based compensation costs in respect of granted restricted share units and restricted stock						$ 59,625		$ 59,625
Marlin Capital Investments, LLC [Member] | Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units and restricted stock outstanding						2,000,000		2,000,000
Shares vested beginning date								Oct. 13, 2015
Share-based compensation description								These RSUs vest annually beginning from October 13, 2015 only if certain performance goals of the Company are met. The shares underlying such RSUs will not be delivered until October 13, 2018, unless there is a change of control of the Company.
Share-based compensation expense						$ 315	315	$ 937	937
Frost Gamma [Member] | Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted share units and restricted stock, granted				3,000,000
Third-party vendors [Member] | Restricted Stock Units [Member] | General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expenses						$ 0	$ 37	$ 0	$ 166
2015 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock authorized for issuance		13,500,000									12,500,000	2,500,000
Common stock reserved for future issuance						3,838,658		3,838,658
Increase in shares of common stock authorized and included in future issuance		1,000,000
2008 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance						180,568		180,568
[1] 650,000 shares of restricted stock were granted during the nine months ended September 30, 2017, and 150,000 shares of restricted stock were unvested as of September 30, 2017.

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