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Income taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |
Statutory federal income tax rate | 34.00% | 34.00% | 34.00% | 34.00% |  |
Effective income tax rate, percentage | 0.00% | 32.00% | 0.00% | 33.00% |  |
Percentage of tax benefits likelihood of being realized upon settlement of tax authority |  |  | greater than 50% |  |  |
Unrecognized tax benefits | $ 1,668,000 |  | $ 1,668,000 |  |  | $ 1,668,000
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 |
Uncertain tax position, reduction in deferred tax assets |  |  |  |  | 1,668,000 |
Benefit for income taxes recognized for the loss |  |  |  |  | $ 0 |
Accrued interest and penalties to uncertain tax positions | $ 0 |  | $ 0 |  |  |

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