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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ 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
Calculation of basic and diluted loss per share [Abstract]                    
Net loss $ (4,485) $ (4,956) $ (4,130) $ (5,608) $ (6,417) $ (4,934) $ (6,450) $ (7,605) $ (19,180) $ (25,406)
Basic and diluted weighted average number of shares outstanding (in shares)                 68,564,321 62,985,763
Basic and diluted loss per share (in dollars per share) $ (0.07) $ (0.07) $ (0.06) $ (0.08) $ (0.09) $ (0.08) $ (0.10) $ (0.13) $ (0.28) $ (0.40)