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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss available for common shareholders - basic and diluted | $ (5,370) | $ (4,070) | $ (3,476) | $ (3,553) | $ (4,298) | $ (3,513) | $ (2,769) | $ (3,962) | $ (16,472) | $ (14,542) | $ (18,120)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic and diluted |  |  |  |  |  |  |  |  | 51,958 | 46,540 | 41,599
Net loss per share - basic and diluted | $ (0.09) | $ (0.08) | $ (0.07) | $ (0.07) | $ (0.09) | $ (0.07) | $ (0.06) | $ (0.09) | $ (0.32) | $ (0.31) | $ (0.44)

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