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Commitments and contingencies (Details)
1 Months Ended 3 Months Ended
May 31, 2017
ft²
item
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Future minimum lease payments          
Rent expenses   $ 100,000 $ 100,000    
Defined contribution   39,000 $ 16,000    
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   15,000   $ 16,000  
Future minimum lease payments          
2021 (represents remaining nine months in 2021)   240,000      
2022   153,000      
Total   $ 393,000      
Lab equipment          
Operating leases          
Lease term         1 year
Fixed monthly payments         $ 18,000