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Stockholders' equity (Details) - $ / shares
Mar. 31, 2021
Mar. 31, 2020
Stockholders' Equity    
Shares authorized (in shares) 150,000,000 150,000,000
Par value (in dollars per share) $ 0.001 $ 0.001
Common stock    
Stockholders' Equity    
Common stock reserved for issuance 14,572,115 10,449,033
Undesignated preferred stock | Initial public offering    
Stockholders' Equity    
Undesignated preferred stock, authorized 10,000,000  
Preferred stock, Par Value (in dollars per share) $ 0.001  
Undesignated preferred shares issued 0  
Undesignated preferred shares outstanding 0