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Summary of Significant Accounting Policies - Summary of Basic and Diluted Loss per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net loss $ (4,687) $ (3,477) $ (14,030) $ (11,595)
Weighted average shares outstanding        
Weighted average common shares outstanding 2,326,893 1,289,657 2,229,422 1,119,639
Basic and diluted net loss per share $ (2.01) $ (2.70) $ (6.29) $ (10.36)