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Income taxes - Schedule of Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ 0	$ 0
State	0	0
Current Federal, State and Local, Tax Expense (Benefit), Total	0	0
Deferred
Federal	3,726	(7,117)
State	81	(1,855)
Less: valuation allowance	(3,761)	8,972
Deferred Federal, State and Local, Tax Expense (Benefit), Total	46	0
Income tax expense	$ 46	$ 0

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