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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 41,214 $ 70,790
Prepaid expenses and other current assets 3,696 5,485
Total current assets 44,910 76,275
Property and equipment - net 183,533 176,557
State research and development credit exchange receivable 463 298
Other assets 7,400 5,516
Total 236,306 258,646
Current liabilities:    
Accounts payable 5,086 3,860
Accrued expenses and other current liabilities 20,579 21,634
Facility financing obligation 37,744 102,300
Share-based compensation liability 55,824  
Total current liabilities 119,233 127,794
Senior convertible notes 98,889 98,439
Note payable to principal stockholder 49,521 49,521
Other liabilities 15,040 13,605
Total liabilities 282,683 289,359
Commitments and contingencies      
Stockholders' equity (deficit):    
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at June 30, 2014 and December 31, 2013      
Common stock, $0.01 par value - 550,000,000 shares authorized at June 30, 2014 and December 31, 2013; 394,036,984 and 369,391,972 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively 3,964 3,697
Additional paid-in capital 2,371,487 2,261,996
Accumulated other comprehensive loss (4) (4)
Deficit accumulated during the development stage (2,421,824) (2,296,402)
Total stockholders' equity (deficit) (46,377) (30,713)
Total $ 236,306 $ 258,646