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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued expenses and other current liabilities    
Accrued clinical and development expenditure $ 9,432 $ 9,637
Accrued employee expenses 4,069 7,553
Accrued rent and property expenses   426
Other accrued expenditure 2,027 2,422
Other 299 316
Total $ 15,827 $ 20,354