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Net Loss per Share - Basic and diluted net loss per share attributable to common stockholders (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Loss per Share                
Net loss $ (3,110) $ (1,490) $ 223 $ (1,791) $ (1,674) $ (2,506) $ (4,377) $ (5,971)
Cumulative preferred stock dividends (1,859)     (1,064)     (4,326) (3,170)
Net loss attributable to common stockholders $ (4,969)     $ (2,855)     $ (8,703) $ (9,141)
Weighted-average common shares outstanding, basic (in shares) 611,680     537,315     585,320 498,415
Weighted-average common shares outstanding, diluted (in shares) 611,680     537,315     585,320 498,415
Net loss per share, basic (in dollars per share) $ (8.12)     $ (5.31)     $ (14.87) $ (18.34)
Net loss per share, diluted (in dollars per share) $ (8.12)     $ (5.31)     $ (14.87) $ (18.34)