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Income Taxes - Operating Loss Carryforwards (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 326,700
U.S. NOLs
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	272,696
U.S. NOLs | 2019 - 2023
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
U.S. NOLs | 2024 - 2028
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
U.S. NOLs | 2028 - 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	194,381
U.S. NOLs | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	78,315
Foreign NOLs
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	53,983
Foreign NOLs | 2019 - 2023
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	9,022
Foreign NOLs | 2024 - 2028
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,901
Foreign NOLs | 2028 - 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	208
Foreign NOLs | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	42,852
R&D Credits
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	609
R&D Credits | 2019 - 2023
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0
R&D Credits | 2024 - 2028
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0
R&D Credits | 2028 - 2038
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	609
R&D Credits | Does not expire
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 0

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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