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Income Taxes - 10-Q (Details) - USD ($)			6 Months Ended		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 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.

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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.

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

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