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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate, percentage	2.00%	(0.00%)
U.S. corporate statutory income tax rate	21.00%	34.00%
Unrecognized tax benefits	$ 1,480

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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-SubTopic 10
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