Annual report pursuant to Section 13 and 15(d)

Related party transactions (Details)

v3.23.1
Related party transactions (Details) - Director - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Related Party Transactions [Abstract]        
Director fees incurred $ 0.3 $ 0.4    
Director fees payable $ 0.1 $ 0.1    
Convertible Subordinated Debt        
Related Party Transactions [Abstract]        
Subordinated convertible notes issued     $ 2.2 $ 0.8