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Share-based compensation - Additional Information (Detail) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Mar. 12, 2018 | Sep. 06, 2017 | Dec. 08, 2015 | Nov. 16, 2015 | Oct. 14, 2014 | Jan. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 29, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 9,262,000 | $ 14,948,000 |
Share-based compensation expense |  |  |  |  |  |  |  |  | $ 2,614,000 |  | $ 9,319,000 | 24,975,000 | 16,631,000 |
Closing stock market price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.45
Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Consulting services agreement effective date |  |  | Jun. 23, 2017 |  |  |  |  |  |  |  |  |  |  |
Business consulting services agreement period |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 302,000 |  |  | 302,000 |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation costs in respect of granted RSUs |  |  |  |  |  |  |  |  | 12,966,000 |  |  | $ 12,966,000 |  |
Unrecognized share-based compensation weighted average period |  |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |
Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 6,468,000 |  |  |  |
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. |  |
Share units, granted |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |
Restricted share units, issued |  |  |  |  |  |  | 1,250,000 | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  |  |  |  |  |  |  |  |  |  |  | 47,500 |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | 0 |  | 30,000 | $ 243,000 | 60,000 |
Unrecognized share-based compensation cost with respect to outstanding stock options |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |
Restricted Stock Units, Common Stock Grants and Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock units outstanding |  |  |  |  |  |  |  | 8,150,905 | 3,750,003 |  |  | 3,750,003 |  |
Share units, granted | [1] |  |  |  |  |  |  |  |  |  |  | 4,368,125 |  |
Share vested not delivered | [2] |  |  |  |  |  |  |  |  |  |  | 11,455,574 |  |
Restricted stock units, common stock grants and restricted stock, compensation cost |  |  |  |  |  |  |  |  | $ 2,738,000 |  | $ 9,624,000 | $ 25,196,000 | $ 17,152,000 |
Marlin Capital Investments, LLC [Member] | 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 [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 7,650,090 |  |  | 7,650,090 |  |
2008 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  |  |  |  | 303,074 |  |  | 303,074 |  |
The Acceleration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 4,960,498 |  |  |  |  |  |  |  |  |  |  |  |
The Acceleration [Member] | Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
The Acceleration [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 47,500 |  |  |  |  |  |  |  |  |  |  |  |
The Acceleration [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |
The Acceleration [Member] | Marlin Capital Investments, LLC [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares accelerated |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Spin-off Grants [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share units, granted |  |  |  |  |  |  |  |  |  |  |  | 304,000 |  |
Share vested not delivered |  |  |  |  |  |  |  |  |  | 304,000 |  |  |  |
Spin-off Grants [Member] | Restricted Stock Units [Member] | Vested Subject to Deferred Delivery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share vested not delivered |  |  |  |  |  |  |  |  |  |  |  | 2,041,000 |  |
Spin-off Grants [Member] | Common Stock Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share units, granted |  |  |  |  |  |  |  |  |  | 304,000 |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 881,000 |  |  |  |
Transaction Grants [Member] | Common Stock Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 5,409,000 |  |  |  |
Transaction Grants [Member] | Common Stock Grants [Member] | Vested Subject to Deferred Delivery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share vested not delivered |  |  |  |  |  |  |  |  |  | 2,041,000 |  |  |  |
Shares vested period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
The Acceleration and Spin-off Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share-based compensation expense |  |  |  |  |  |  |  |  |  | $ 15,548,000 |  |  |  |
[1] | As discussed in “Spin-off of red violet” above, among the RSUs granted during the six months ended June 30, 2018, there were an aggregate of 304,000 shares of Spin-off Grants that vested and were delivered in the first quarter of 2018, and an aggregate of 2,041,000 shares of Transaction Grants that vested but were subject to deferred delivery over a three-year period.
[2] | Among the shares vested and delivered during the six months ended June 30, 2018, there were 6,273,318 shares that were vested but deferred from prior periods. See (4) below.

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