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Loss per Share - Computation of Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:                
Net loss $ (8,089) $ (5,072) $ (3,696) $ (4,185) $ (4,001) $ (4,733) $ (16,857) $ (12,919)
Denominator:                
Weighted-average common shares, basic 26,108     26,007     26,105 26,004
Incremental dilutive shares               0
Weighted-average common shares, dilutive 26,108     26,007     26,105 26,004
Basic net loss per common share $ (0.31)     $ (0.16)     $ (0.65) $ (0.50)
Diluted net loss per common share $ (0.31)     $ (0.16)     $ (0.65) $ (0.50)
Warrants                
Denominator:                
Dilutive effect of stock options               0
Employee Options                
Denominator:                
Dilutive effect of stock options               0