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Income taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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 | Advertising Business
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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