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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data (Unaudited)                      
Revenues                     $ 11,500
Operating loss $ (32,590) $ (30,245) $ (27,952) $ (26,706) $ (23,066) $ (23,404) $ (22,816) $ (18,079) $ (117,493) $ (87,365) (55,015)
Net loss $ (31,245) $ (30,962) $ (28,607) $ (27,369) $ (17,647) $ (23,990) $ (23,224) $ (14,298) $ (118,183) $ (79,159) $ (56,073)
Basic and diluted net loss per share (in dollars per share) $ (0.51) $ (0.50) $ (0.47) $ (0.55) $ (0.36) $ (0.54) $ (0.59) $ (0.36) $ (2.02) $ (1.84) $ (1.60)