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Share-based payments - Additional Information (Detail) - USD ($)					3 Months Ended		12 Months Ended
		Dec. 08, 2015	Nov. 16, 2015	Oct. 13, 2014	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Apr. 27, 2015	Mar. 21, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing stock market price					$ 5.80
Unrecognized share-based compensation cost in respect of granted share options					$ 389,000
Unrecognized share-based compensation weighted average period					3 years 6 months
General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation cost recognized					$ 6,832,000	$ 59,000
Michael Brauser, Executive Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual base salary			$ 25,000
Stockholder Approval [Member] | Michael Brauser, Executive Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issuable upon exercise of stock option			5,000,000
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units outstanding	[1]				13,291,579		13,721,000
Unrecognized share-based compensation weighted average period					3 years 2 months 12 days
Restricted stock units, compensation cost					$ 7,511,000	100,000
Unrecognized share-based compensation costs in respect of granted restricted share units					$ 92,179,000
Restricted Stock Units [Member] | Michael Brauser, Executive Chairman of the Board [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years
Restricted share units, granted			5,000,000
RSU vesting condition					no portion of the RSUs shall vest unless and until the Company has, for any one fiscal year in which the RSUs are outstanding, gross revenue determined in accordance with the Company’s audited financial statements in excess of $100.0 million for such fiscal year and positive EBITDA (as determined based on the Company’s audited financial statements) for such fiscal year, after subtracting all charges for equity compensation paid to executives or other service providers to the Company (collectively, the “Vesting Conditions”).
Restricted Stock Units [Member] | Stockholder Approval [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted share units, granted					12,312,000		12,312,000
Restricted Stock Units [Member] | Marlin Capital Investments, LLC [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted share units, granted				2,000,000
Restricted Stock Units [Member] | Frost Gamma [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted share units, granted		3,000,000					3,000,000
Restricted Stock Units [Member] | Third-party vendors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common shares to vendors for services rendered, shares					12,000
Restricted stock units, amortization cost					$ 129,000
Restricted Stock Units [Member] | Best One Inc [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of convertible preferred stock as a result of acquisition					960,000
Restricted Stock Units [Member] | Best One Inc [Member] | Marlin Capital Investments, LLC [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units outstanding					2,000,000
Issuance of convertible preferred stock as a result of acquisition					2,000,000
Share-based compensation description					The RSUs vest annually beginning October 13, 2015 provided certain performance goals of the Company are met. The performance goals of the Company were met in January 2016. The shares underlying such RSUs will not be delivered until October 13, 2018, unless there is a change of control of the Company.
Restricted Stock Units [Member] | Best One Inc [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period					2 years
Restricted Stock Units [Member] | Best One Inc [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period					4 years
Employee Stock Option [Member] | General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation cost recognized					$ 16,000	$ 2,000
2008 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance					80,568				136,068
2015 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance					6,738,000
Share options authorized								2,500,000
Increase in shares authorized			12,500,000
[1] Among the total unvested balance as of March 31, 2016 and December 31, 2015, 12,312,000 shares, with weighted average grant-date fair value of $9.48, are subject to the Stockholder Approval. Among such shares, 3,000,000 shares were granted to Frost Gamma, and were vested fully on the grant date, and the remaining shares have a vesting period ranging from three to four years. For accounting purposes, the grant date was determined to be in 2015, as the Company concluded the Stockholder Approval was perfunctory.

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