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Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Current Assets    
Prepaid insurance $ 1,186 $ 243
Prepaid advertising   1,802
Prepaid IT 1,080 666
Prepaid expenses - other 3,925 2,672
Value-added tax ("VAT") receivable 9,897  
Receivable - other 1,851 2,274
Other 156 956
Total $ 18,095 $ 8,613