Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Unrecognized tax benefits $ 1,200,000 $ 1,100,000
Accrued interest and penalties relating to unrecognized tax benefits $ 0 $ 1,400