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Quarterly Summarized Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
As Reported
Jun. 30, 2013
As Reported
Mar. 31, 2013
As Reported
Dec. 31, 2012
As Reported
Sep. 30, 2012
As Reported
Jun. 30, 2012
As Reported
Mar. 31, 2012
As Reported
Sep. 30, 2013
As Restated
Jun. 30, 2013
As Restated
Mar. 31, 2013
As Restated
Dec. 31, 2012
As Restated
Sep. 30, 2012
As Restated
Jun. 30, 2012
As Restated
Mar. 31, 2012
As Restated
Quarterly Financial Information [Line Items]                                    
Revenue $ 10,106 $ 26,351     $ 8,403 $ 5,500 $ 2,342         $ 8,403 $ 5,500 $ 2,342        
Net loss $ (15,411) $ (166,227) $ (179,184) $ (69,126) $ (48,884) $ (39,774) $ (62,158) $ (10,569) $ (26,426) $ (53,904) $ (88,285) $ (48,884) $ (39,774) $ (62,158) $ (10,569) $ (26,426) $ (53,904) $ (88,285)
Net loss per share                                    
Basic $ (0.09) $ (1.03) $ (1.24) $ (0.53) $ (0.29) $ (0.26) $ (0.41) $ (0.07) $ (0.18) $ (0.38) $ (0.65) $ (0.29) $ (0.26) $ (0.41) $ (0.07) $ (0.18) $ (0.38) $ (0.65)
Diluted $ (0.27) $ (1.28) $ (1.24) $ (0.53) $ (0.29) $ (0.26) $ (0.41) $ (0.07) $ (0.18) $ (0.38) $ (0.65) $ (0.29) $ (0.34) $ (0.43) $ (0.30) $ (0.28) $ (0.38) $ (0.65)