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Property and equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Property and equipment          
Less accumulated depreciation $ (1,897)   $ (1,897)   $ (1,646)
Property and equipment, net 1,016   1,016   1,204
Depreciation 100 $ 100 300 $ 300  
Computer software and equipment          
Property and equipment          
Property and equipment, gross 15   15   15
Office equipment and furniture          
Property and equipment          
Property and equipment, gross 176   176   176
Laboratory equipment          
Property and equipment          
Property and equipment, gross 1,660   1,660   1,597
Leasehold improvements          
Property and equipment          
Property and equipment, gross 1,051   1,051   1,051
Construction-in-progress          
Property and equipment          
Property and equipment, gross $ 11   $ 11   $ 11