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Income taxes - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. corporate statutory income tax rate	21.00%		34.00%	34.00%	34.00%
Operating Loss Carryforward expiration Year			Will expire in 2034
Valuation allowance			$ 10,853,000	$ 1,881,000
Percentage of tax benefits likelihood of being realized upon settlement of tax authority				greater than 50%
Unrecognized tax benefits			1,134,000	$ 1,668,000
Discontinued Operations, Disposed of [Member] | Advertising Business [Member]
Income Taxes [Line Items]
Tax loss resulted from the the disposal of discontinued operation					$ 4,375,000
Uncertain tax position, reduction in deferred tax assets					1,668,000
Unrecognized tax benefits			1,134,000
Benefit for income taxes recognized for the loss					$ 0
Accrued interest and penalties to uncertain tax positions				$ 0
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carryforwards			29,274,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carryforwards			$ 24,046,000
Scenario Forecast [Member]
Income Taxes [Line Items]
U.S. corporate statutory income tax rate		21.00%

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