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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued expenses and other current liabilities    
Accruals for services provided by vendors-not yet billed $ 6,629 $ 5,425
Personnel related accruals and liabilities 6,621 7,032
Total $ 13,250 $ 12,457