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Other Assets and Liabilities - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Prepaid Expenses and Other Current Assets:    
Valued-added tax recoverable $ 888 $ 1,206
Prepaid and other expenses 4,837 7,106
Guarantee from Armistice 489 0
Income tax receivable 868 518
Other 124 128
Total $ 7,206 $ 8,958