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Income Taxes - Tax Cuts and Jobs Act of 2017 (Details) - USD ($)			6 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2018	Jun. 30, 2019
Federal statutory income tax rate	21.00%	35.00%
Income tax related to remeasurement of deferred tax assets due to change in tax law			$ 0
Reduction in deferred tax assets as remeasured under Tax Cuts and Jobs Act of 2017			26,600,000
Reduction in valuation allowance resulting from remeasurement of deferred tax assets under Tax Cuts and Jobs Act of 2017			$ 26,600,000
Forecast
GILTI income				$ 0
GILTI deductions				$ 0

X

- Definition

Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

+ Details

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- Definition

Increase (decrease) in the amount of deferred tax assets, before allocation of valuation allowances, as remeasured pursuant to Tax Cuts and Jobs Act of 2017.

+ References

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- Definition

The amount of global intangible low-taxed income (GILTI) of foreign subsidiaries taxable under provisions of the Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

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- Definition

The amount of deductions related to global intangible low-taxed income (GILTI) of foreign subsidiaries taxable under provisions of the Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the valuation allowance for deferred tax assets pursuant to Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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