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Loss Per Share - Reconciliation of Basic and Diluted Loss Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                    
Net loss $ (296) $ 1,462 $ 331 $ (1,908) $ (2,053) $ (595) $ (1,049) $ (1,910) $ (411) $ (5,607)
Weighted-average common shares - outstanding, basic                 18,709 17,978
Weighted-average common shares - outstanding, diluted                 18,709 17,978
Net loss per common share, basic $ (0.01) $ 0.08 $ 0.02 $ (0.10) $ (0.11) $ (0.03) $ (0.06) $ (0.11) $ (0.02) $ (0.31)
Net loss per common share, diluted $ (0.01) $ 0.08 $ 0.02 $ (0.10) $ (0.11) $ (0.03) $ (0.06) $ (0.11) $ (0.02) $ (0.31)