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Leases - Future minimum lease payments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 31, 2022
USD ($)
Leases      
Number of operating leases 4    
Renewal term 2 years    
Number of finance leases 4    
Right-of-use assets $ 349    
Short-term lease liabilities 70    
Long-term lease liabilities $ 164    
Weighted average life of operating lease 8 years    
Weighted average life of finance lease 3 years    
Weighted average discount rate of operating lease 8.10%    
Weighted average discount rate of finance lease 8.10%    
Total lease expense $ 463 $ 385  
Copier      
Leases      
Number of finance leases 3    
Copier in westminster facility      
Leases      
Right-of-use assets     $ 38
Short-term lease liabilities     6
Long-term lease liabilities     $ 32
Analytical equipment in laboratory facility      
Leases      
Number of finance leases 1    
Right-of-use assets $ 310    
Short-term lease liabilities 178    
Long-term lease liabilities $ 132    
Principal administrative and production facility      
Leases      
Option to extend two options    
Renewal term 5 years    
Lease for office space at 2275 Half Day Road      
Leases      
Renewal term 3 years