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Share-based compensation - Additional Information (Detail) - USD ($)						1 Months Ended		3 Months Ended			9 Months Ended
	Mar. 12, 2018	Sep. 06, 2017	Dec. 08, 2015	Nov. 16, 2015	Oct. 14, 2014	Jan. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense											$ 11,855,000	$ 25,456,000
Share-based compensation expense								$ 2,593,000		$ 11,071,000	27,568,000	27,702,000
Closing stock market price													$ 2.15
Michael Brauser, Chairman of the Board
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated									2,500,000
Accelerated share-based compensation expense									$ 6,468,000
Annual base salary				$ 25,000
Business consulting services agreement period		4 years
Consulting services agreement effective date		Jun. 23, 2017
Share-based compensation expense								302,000			302,000
Share-based compensation expense									6,468,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation costs in respect of granted RSUs								10,299,000			$ 10,299,000
Unrecognized share-based compensation weighted average period											1 year 9 months 24 days
Restricted Stock Units \| Michael Brauser, Chairman of the Board
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	2,500,000
Accelerated share-based compensation expense									$ 6,468,000
Share units, granted				5,000,000
Award vesting period				4 years
RSU vesting condition											no portion of the RSUs were to vest unless and until the Company had met certain vesting conditions during the vesting period.
Restricted share units, issued						1,250,000	1,250,000
Restricted Stock Units \| Stockholder Approval \| Michael Brauser, Chairman of the Board
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated											47,500
Share-based compensation expense								0		$ 31,000	$ 243,000	$ 91,000
Unrecognized share-based compensation cost with respect to outstanding stock options								$ 0			$ 0
Restricted Stock Units, Common Stock Grants and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units outstanding							8,150,905	3,842,631			3,842,631
Share units, granted											4,565,125
Share vested not delivered											11,462,280
Marlin Capital Investments, LLC \| Michael Brauser Managing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage by Mike Brauser in Marlin Capital Investments LLC					50.00%
Marlin Capital Investments, LLC \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units outstanding					2,000,000
Shares vested beginning date					Oct. 13, 2015						Oct. 13, 2015
Share-based compensation description											These RSUs were to vest annually beginning from October 13, 2015 only if certain performance goals of the Company were met. The shares underlying such RSUs would not have been delivered until October 13, 2018, unless there was a change of control of the Company, termination of the agreement by the Company without cause, or termination of the agreement by Marlin Capital for good reason.
Shares accelerated									500,000
Accelerated share-based compensation expense									$ 906,000
Share vested not delivered	500,000
Frost Gamma \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units, granted			3,000,000
Restricted share units, issued									3,000,000
2018 and 2015 Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance								13,500,000			13,500,000
Two Thousand Eighteen Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance , percentage								10.00%			10.00%
Common stock reserved for future issuance								7,529,133			7,529,133
2008 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance								310,568			310,568
2015 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance								303,074			303,074
The Acceleration
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	5,157,998
Accelerated share-based compensation expense	$ 14,667,000
The Acceleration \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	4,960,498
The Acceleration \| Restricted Stock Units \| Michael Brauser, Chairman of the Board
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	2,500,000
The Acceleration \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	47,500
The Acceleration \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	150,000
The Acceleration \| Marlin Capital Investments, LLC \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares accelerated	500,000
Spin-off Grants \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units, granted											304,000
Award vesting period											3 years
Share vested not delivered									304,000		2,041,000
Spin-off Grants \| Common Stock Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units, granted									304,000
Share-based compensation expense									$ 881,000
Transaction Grants \| Common Stock Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share vested not delivered									2,041,000
Shares vested period									3 years
Share-based compensation expense									$ 5,409,000
The Acceleration and Spin-off Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated share-based compensation expense									$ 15,548,000