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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)