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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating loss | $ (5,526) | $ (6,702) | $ (10,587) | $ (10,202) | $ (11,825) | $ (12,175) | $ (15,316) | $ (14,554) | $ (33,019) | $ (53,871) | $ (46,456)
Change in fair value of warranty liability, net | 410 | (497) | 5,115 | (2,272) | 1,134 | 446 | 917 | (338) | 2,800 |  |
Net loss | $ (4,792) | $ (7,206) | $ (5,482) | $ (12,845) | $ (10,657) | $ (11,813) | $ (14,512) | $ (14,889) | $ (30,324) | $ (51,868) | $ (30,885)
Basic and diluted loss per share (in dollars per share) | $ (0.04) | $ (0.07) | $ (0.06) | $ (0.15) | $ (0.14) | $ (0.18) | $ (0.26) | $ (0.31) | $ (0.30) | $ (0.85) | $ (0.68)

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