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Accrued expenses and other current liabilities, other non-current expenses - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued expenses and other current liabilities, other non-current expenses    
Accruals for services provided by vendors-not yet billed $ 2,965 $ 1,999
Personnel related accruals and liabilities 4,346 5,688
Other current liabilities   545
Total $ 7,311 $ 8,232