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Operating leases (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 18, 2018
ft²
Oct. 13, 2016
USD ($)
ft²
item
Operating leases        
Leased space (in square feet) | ft²     6,172 16,500
Lease renewal options | item       1
Renewal term (in years)       5 years
Deferred lease incentive       $ 400
Rent expense inclusive of lease incentives $ 900 $ 700    
Future minimum annual rental commitments        
2020 864      
2021 876      
2022 590      
Total $ 2,330