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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 28,529 $ 61,840
State research and development credit exchange receivable - current 450 450
Prepaid expenses and other current assets 3,183 4,520
Total current assets 32,162 66,810
Property and equipment - net 179,567 183,961
State research and development credit exchange receivable - net of current portion 470 313
Other assets 230 230
Total 212,429 251,314
Current liabilities:    
Accounts payable 5,419 4,555
Accrued expenses and other current liabilities 26,984 25,777
Senior convertible notes 114,744 114,443
Note payable to related party 119,635  
Total current liabilities 266,782 144,775
Senior convertible notes 98,004 97,583
Note payable to related party   119,635
Total liabilities 364,786 361,993
Commitments and contingencies      
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value - 10,000,000 shares authorized; no shares issued or outstanding at June 30, 2013 and December 31, 2012      
Common stock, $0.01 par value - 550,000,000 shares authorized at June 30, 2013 and December 31, 2012; 300,869,683 and 286,035,082 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively 3,012 2,860
Additional paid-in capital 2,036,640 1,991,379
Accumulated other comprehensive loss (8) (6)
Deficit accumulated during the development stage (2,192,001) (2,104,912)
Total stockholders' deficit (152,357) (110,679)
Total $ 212,429 $ 251,314