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Debt - Interest expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Expense, net      
Interest under bank facilities $ 315 $ 2,669 $ 18,627
Debt discount and deferred financing costs amortization 168 275 1,752
Finance lease interest 877    
Finance lease interest, before adoption of ASU 2016-02   734 311
Other 164 45 82
Interest income 2,403 128 5
Interest (income) expense, net $ (879) $ 3,595 $ 20,767