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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues $ 26,351    
Operating Expenses:      
Cost of goods sold 11,912    
Research and development 72,750 58,956 21,602
Selling, general and administrative 123,795 57,794 22,559
Total operating expenses 208,457 116,750 44,161
Operating loss (182,106) (116,750) (44,161)
Gain (loss) on change in fair value of derivative liabilities 47,710 (35,344) (22,669)
Interest expense (34,179) (18,091) (1)
Interest income 343 544 231
Other (expense) income, net (1,189) (427) (10)
Loss from operations before taxes (169,421) (170,068) (66,610)
Benefit from (provision for) income taxes 3,194 (9,116) (2,516)
Net loss $ (166,227) $ (179,184) $ (69,126)
Loss per share:      
Basic $ (1.03) $ (1.24) $ (0.53)
Diluted $ (1.28) $ (1.24) $ (0.53)
Weighted average shares outstanding:      
Basic 161,022 144,017 130,247
Diluted 167,070 144,017 130,247