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Derivative Instruments and Hedging Activity - Consolidated statements of operations and other comprehensive loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative Instruments, Amount of Income/(Loss) Recognized in OCI on Derivative (Effective Portion) $ 193 $ 622
Derivative Instruments, Amount of Income/(Loss) Reclassified from Accumulated OCI into Expense (Effective Portion) $ (139) $ 1,313