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Fair Value Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurements    
Fair value transfer assets , level 1 to level 2 $ 0 $ 0
Fair value transfer assets , level 2 to level 1 0 0
Fair value transfer liabilitiess , level 1 to level 2 0 0
Fair value transfer liabilities , level 2 to level 1 0 0
Fair value transfer assets into level 3 0 0
Fair value transfer assets out of level 3 0 0
Fair value transfer liabilities into level 3 0 0
Fair value transfer liabilities out of level 3 $ 0 $ 0