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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 35,759 $ 70,790
Prepaid expenses and other current assets 3,640 5,485
Total current assets 39,399 76,275
Property and equipment - net 176,337 176,557
State research and development credit exchange receivable - net of current portion 380 298
Other assets 8,437 5,516
Total 224,553 258,646
Current liabilities:    
Accounts payable 3,638 3,860
Accrued expenses and other current liabilities 15,006 21,634
Facility financing obligation 25,871 102,300
Total current liabilities 44,515 127,794
Senior convertible notes 98,662 98,439
Note payable to principal stockholder 49,521 49,521
Other liabilities 14,319 13,605
Total liabilities 207,017 289,359
Commitments and contingencies      
Stockholders' equity (deficit):    
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at March 31, 2014 and December 31, 2013      
Common stock, $0.01 par value - 550,000,000 shares authorized at March 31, 2014 and December 31, 2013; 386,934,914 and 369,391,972 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively 3,869 3,697
Additional paid-in capital 2,362,129 2,261,996
Accumulated other comprehensive loss (4) (4)
Deficit accumulated during the development stage (2,348,458) (2,296,402)
Total stockholders' equity (deficit) 17,536 (30,713)
Total $ 224,553 $ 258,646