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Fair Value Measurement - Transfers (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value Measurement    
Transfer of assets from Level 1 to Level 2 $ 0 $ 0
Transfer of assets from Level 2 to Level 1 0 0
Transfer of liabilities from Level 1 to Level 2 0 0
Transfer of liabilities from Level 2 to Level 1 0 0
Transfer of assets, Level 3, net 0 0
Transfer of liabilities, Level 3, net $ 0 $ 0