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Net Loss per Common Share (Basic and Diluted Net Loss Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Numerator:                  
Net loss $ (6,032) $ (5,448) $ (5,804) $ (5,096) $ (4,575) $ (4,108) $ (11,252) $ (17,284) $ (13,779)
Dividend on convertible exchangeable preferred shares (50) (50) (50) (50)     (101) (151) (151)
Net loss attributable to common shareholders (6,082) (5,498) (5,854) (5,146)     (11,353) (17,435) (13,930)
Remaining undistributed loss (6,082) (5,498) (5,854) $ (5,248)     (11,353) (17,435) $ (14,065)
Redeemable common shareholders                  
Numerator:                  
Net loss attributable to common shareholders   (1,354) (1,455)       (2,809)    
Remaining undistributed loss $ (356) $ (1,354) $ (1,455)       $ (2,809) $ (3,198)  
Denominator:                  
Weighted average common shares outstanding basic 740,379 3,090,477 3,117,100 2,376,721     3,107,715 2,307,279 809,821
Weighted average common shares outstanding diluted 740,379 3,090,477 3,117,100 10,013,317     3,107,715 2,307,279 809,821
Net loss per share - basic $ (0.48) $ (0.44) $ (0.47) $ (0.38)     $ (0.90) $ (1.39) $ (1.10)
Undistributed loss per share - basic (0.48) (0.44) (0.47) (0.42)     (0.90) (1.39) (1.27)
Net loss per share - diluted (0.48) (0.44) (0.47) (0.38)     (0.90) (1.39) (1.10)
Undistributed loss per share - diluted $ (0.48) $ (0.44) $ (0.47) $ (1.30)     $ (0.90) $ (1.39) $ (1.27)
Common Stock                  
Numerator:                  
Net loss attributable to common shareholders   $ (4,144) $ (4,399)       $ (8,544)    
Remaining undistributed loss $ (5,726) $ (4,144) $ (4,399)       $ (8,544) $ (14,237)  
Denominator:                  
Weighted average common shares outstanding basic 11,902,443 9,461,317 9,422,089 9,937,958     9,441,811 10,271,036 10,013,317
Weighted average common shares outstanding diluted 11,902,443 9,461,317 9,422,089 9,937,958     9,441,811 10,271,036 2,376,721
Net loss per share - basic $ (0.48) $ (0.44) $ (0.47) $ (0.43)     $ (0.90) $ (1.39) $ (1.30)
Undistributed loss per share - basic (0.48) (0.44) (0.47) (0.43)     (0.90) (1.39) (1.30)
Net loss per share - diluted (0.48) (0.44) (0.47) (0.43)     (0.90) (1.39) (1.30)
Undistributed loss per share - diluted $ (0.48) $ (0.44) $ (0.47) $ (0.43)     $ (0.90) $ (1.39) $ (0.42)