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Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Other Current Assets    
Prepaid insurance $ 2,681 $ 505
Prepaid IT 867 698
Prepaid expenses - other 4,190 3,371
Value-added tax ("VAT") receivable 5,915 11,920
Receivable - other 915 2,176
Other 103 177
Total $ 14,671 $ 18,847