Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details)

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Fair Value - Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Details) - Recurring Basis - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Financial assets carried at fair value $ 0 $ 0
Financial liabilities carried at fair value $ 0 $ 0