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Income taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |
U.S. corporate statutory income tax rate | 21.00% | 34.00% | 21.00% | 34.00% | 34.00% |
Effective income tax rate, percentage | 0.00% | 0.00% | 0.00% | 0.00% |  |
Percentage of tax benefits likelihood of being realized upon settlement of tax authority |  |  | greater than 50% |  |  |
Unrecognized tax benefits | $ 1,079,000 |  | $ 1,079,000 |  | $ 1,134,000 |
Benefit for income taxes recognized for the loss | 0 | $ 0 | 0 | $ 0 |  |
Discontinued Operations, Disposed of [Member] | Advertising Business [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax loss resulting from the the disposal of discontinued operation |  |  |  |  |  | $ 4,375,000
Benefit for income taxes recognized for the loss |  |  |  |  |  | $ 0
Accrued interest and penalties to uncertain tax positions | $ 0 |  | $ 0 |  |  |

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