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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits—beginning balance	$ 10,200	$ 17,370	$ 14,130
Increase related to tax positions taken during prior year	108	0	0
Decrease related to tax positions taken during prior year	(2)	(7,739)	0
Increase related to tax positions taken during current year	667	569	3,240
Gross unrecognized tax benefits—ending balance	$ 10,973	$ 10,200	$ 17,370

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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