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Income taxes - Schedule of Benefit for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal		$ (123)
State	$ 87
Current Federal, State and Local, Tax Expense (Benefit), Total	87	(123)
Deferred
Federal	(14,278)	(15,771)	$ (167)
State	(1,732)	(689)
Valuation allowance	1,881
Deferred Federal, State and Local, Tax Expense (Benefit), Total	(14,129)	(16,460)	(167)
Income tax benefit	$ (14,042)	$ (16,583)	$ (167)

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