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Net Income (Loss) Per Share - Computation of Basic and Diluted Net Loss per Share (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
Earnings Per Share [Abstract]                
Net loss from continuing operations $ (7,077)     $ (6,948)     $ (22,811) $ (23,752)
Income from discontinued operations 80     157     626 13,055
Net loss $ (6,997) $ (7,932) $ (7,256) $ (6,791) $ (6,803) $ 2,897 $ (22,185) $ (10,697)
Basic and diluted net income (loss) per share:                
Net loss from continuing operations per share $ (1.45)     $ (2.15)     $ (4.94) $ (7.35)
Net income from discontinued operations per share 0.02     0.05     0.14 4.04
Basic and diluted net loss per basic share $ (1.43)     $ (2.10)     $ (4.80) $ (3.31)
Weighted-average shares used to compute per share calculations 4,891,881     3,232,811     4,617,357 3,233,257