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Income Taxes - Taxes Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S.—Federal	$ 0	$ 0	$ 0
U.S.—State	2	23	0
Foreign	0	0	(299)
Deferred:
U.S.—Federal	(1,321)	(7,046)	(14,685)
U.S.—State	0	(889)	(1,804)
Foreign	0	0	0
Total	$ (1,319)	$ (7,912)	$ (16,788)

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