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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provisions for income taxes	$ 295	$ 534
Corporate tax rate	21.00%		35.00%
Gross amount of unrecognized tax benefits	$ 6,000
Unrecognized tax benefits that would reduce effective tax rate	$ 700

X

- Definition

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

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

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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