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Net Loss per Share - Basic and Diluted Net Loss per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:                
Net loss $ (1,827) $ (1,787) $ (4,779) $ (6,368) $ (7,992) $ (8,422) $ (8,393) $ (22,782)
Denominator:                
Weighted average common shares outstanding - basic 4,541,167     4,541,179     4,541,167 4,538,707
Weighted average common shares outstanding - diluted 4,541,167     4,541,179     4,541,167 4,538,707
Net loss per share - basic $ (0.4)     $ (1.4)     $ (1.85) $ (5.02)
Net loss per share - diluted $ (0.4)     $ (1.4)     $ (1.85) $ (5.02)