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Fixed assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fixed assets      
Gross fixed assets $ 20,177 $ 41,220  
Less accumulated depreciation and amortization (7,483) (32,844)  
Net fixed assets 12,694 8,376  
Depreciation 2,600 2,300 $ 3,300
Leasehold improvements      
Fixed assets      
Gross fixed assets 2,384 14,078  
Computer equipment and software      
Fixed assets      
Gross fixed assets 4,609 5,471  
Furniture, fixtures, and lab equipment      
Fixed assets      
Gross fixed assets 9,965 20,776  
Assets in process      
Fixed assets      
Gross fixed assets $ 3,219 $ 895