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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued expenses and other current liabilities    
Accrued employee compensation and benefits $ 563 $ 304
Accrued external research and development expenses 580 430
Accrued legal and professional fees 66 106
Liability for early exercise of stock options and restricted stock 261  
Other 22 129
Total $ 1,492 $ 969