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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 93,803 $ 61,840
State research and development credit exchange receivable - current 298 450
Prepaid expenses and other current assets 5,228 4,520
Total current assets 99,329 66,810
Property and equipment - net 177,829 183,961
State research and development credit exchange receivable - net of current portion 223 313
Other assets 10,227 230
Total 287,608 251,314
Current liabilities:    
Accounts payable 7,786 4,555
Accrued expenses and other current liabilities 21,553 25,777
Senior convertible notes 114,897 114,443
Facility financing obligation 72,933  
Total current liabilities 217,169 144,775
Senior convertible notes 98,220 97,583
Note payable to related party 119,635 119,635
Other liabilities 20,306  
Total liabilities 455,330 361,993
Commitments and contingencies      
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at September 30, 2013 and December 31, 2012      
Common stock, $0.01 par value - 550,000,000 shares authorized at September 30, 2013 and December 31, 2012; 309,993,285 and 286,035,082 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively 3,100 2,860
Additional paid-in capital 2,072,006 1,991,379
Accumulated other comprehensive loss (9) (6)
Deficit accumulated during the development stage (2,242,819) (2,104,912)
Total stockholders' deficit (167,722) (110,679)
Total $ 287,608 $ 251,314