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Summary of Significant Accounting Policies (Net Loss Per Share) (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
Numerator: |  |  |  |  |  |  |  |  |  |
Net loss available for common shareholders | $ (3,284) | $ (6,141) | $ (8,990) | $ (8,068) | $ (11,948) | $ 289 | $ (8,459) | $ (7,132) | $ (26,483) | $ (27,250)
Dilutive incremental share effect from: |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 111,297 | 86,983
Net loss per share - basic and diluted | $ (0.03) | $ (0.05) | $ (0.08) | $ (0.08) | $ (0.13) | $ 0 | $ (0.10) | $ (0.09) | $ (0.24) | $ (0.31)

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