Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers Contract Assets and Liabilities (Details)

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Revenue from Contracts with Customers Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Contract asset $ 0 $ 0
Contract liabilities 9,000 $ 0
Deferred Revenue 6,450  
Revenue recognized $ 2,550