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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 70,790 $ 61,840
State research and development credit exchange receivable - current   450
Prepaid expenses and other current assets 5,485 4,520
Total current assets 76,275 66,810
Property and equipment - net 176,557 183,961
State research and development credit exchange receivable - net of current portion 298 313
Other assets 5,516 230
Total 258,646 251,314
Current liabilities:    
Accounts payable 3,860 4,555
Accrued expenses and other current liabilities 21,634 25,777
Facility financing obligation 102,300  
Senior convertible notes   114,443
Total current liabilities 127,794 144,775
Senior convertible notes 98,439 97,583
Note payable to principal stockholder 49,521 119,635
Other liabilities 13,605  
Total liabilities 289,359 361,993
Commitments and contingencies      
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at December 31, 2012 and 2013      
Common stock, $0.01 par value - 550,000,000 shares authorized at December 31, 2012 and 2013, respectively; 286,035,082 and 369,391,972 shares issued and outstanding at December 31, 2012 and 2013, respectively 3,697 2,860
Additional paid-in capital 2,261,996 1,991,379
Accumulated other comprehensive income (loss) (4) (6)
Deficit accumulated during the development stage (2,296,402) (2,104,912)
Total stockholders' deficit (30,713) (110,679)
Total $ 258,646 $ 251,314