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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Numerator: |  |  |  |  |  |  |  |  |  |
Net loss available for common shareholders | $ (11,948) | $ 289 | $ (8,459) | $ (7,132) | $ (8,119) | $ (5,762) | $ (5,656) | $ (5,949) | $ (27,250) | $ (25,486)
Dilutive incremental share effect from: |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 86,983 | 72,786
Net loss per share - basic and diluted | $ (0.13) | $ 0 | $ (0.10) | $ (0.09) | $ (0.10) | $ (0.08) | $ (0.08) | $ (0.09) | $ (0.31) | $ (0.35)

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