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Commitments and contingencies (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
ft²
item
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Future minimum lease payments              
Rent expenses   $ 100,000 $ 100,000 $ 200,000 $ 200,000    
Defined contribution   33,000 $ 18,000 100,000 $ 50,000    
Payments of developmental and regulatory milestone   2,600,000   2,600,000      
Office and laboratory space              
Operating leases              
Lease term 62 months            
Space of leased area | ft² 11,000            
Number of additional extension of lease terms | item 2            
Additional lease term 5 years            
Deferred rent   11,000   11,000   $ 16,000  
Future minimum lease payments              
2021 (represents remaining three months in 2021)   57,000   57,000      
2022   153,000   153,000      
Total   $ 210,000   $ 210,000      
Lab equipment              
Operating leases              
Lease term             1 year
Fixed monthly payments             $ 18,000