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Fair Value Measurements - Narrative (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
impaired_asset_and_liability
Dec. 31, 2017
USD ($)
Fair Value Disclosures [Abstract]    
Fair value assets, level 1 to level 2 $ 0 $ 0
Fair value liabilities, level 1 to level 2 0 0
Fair value assets, level 2 to level 1 0 0
Fair value liabilities, level 2 to level 1 $ 0 $ 0
Number of non-financial assets and liabilities impaired | impaired_asset_and_liability 0