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Income Taxes - 10-Q (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes
Income tax (benefit) provision		$ 0	$ 0
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract]
U.S. Federal statutory tax rate	21.00%			35.00%
Tax benefit related to remeasurement				$ 15,200,000
Valuation allowance offset to remeasurement tax benefit				$ 15,200,000

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Amount of reasonable estimate for the increase (decrease) in income tax expense (benefit) attributable to the increase (decrease) in the valuation allowance for remeasurement of deferred tax from change in tax rate pursuant to the Tax Cut And Jobs Act of 2017 for which accounting is incomplete.

+ References

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Subparagraph (SAB Topic 6.I.7)
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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