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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (142,189) $ (183,809)
Adjustments to reconcile (loss) income to net cash used in operating activities:    
Depreciation and amortization 75 32
Stock-based compensation 8,709 3,360
Shares issued for services 14 44
Excess tax benefit from stock-based awards (7,960) (1,061)
Accrued interest payable 2,508  
Amortization of debt discount and debt issuance costs 6,020  
Loss on change in fair value of derivative liability 85,139 160,017
Changes in assets and liabilities:    
Other current assets (4,596) 535
Other non-current assets (5,533) (707)
Change in lease liability (46) (50)
Accounts payable and other liabilities 14,505 (2,303)
Net cash used in operating activities (39,122) (19,586)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (264) (9)
Purchase of long term investment (825)  
Net cash used in investing activities (1,089) (9)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs   98,654
Proceeds from exercise of stock options, net of transaction costs 6,678 4,954
Proceeds from exercise of warrants, net of transaction costs 14,930 14,930
Excess tax benefit from stock-based awards 7,960 1,061
Proceeds from issuance of exchangeable debt, net of transaction costs 144,316  
Payments under capital leases (20)  
Net cash provided by financing activities 173,864 119,599
NET INCREASE IN CASH AND CASH EQUIVALENTS 133,653 100,004
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 116,602 31,442
CASH AND CASH EQUIVALENTS, END OF PERIOD 250,255 131,446
Cash paid during the year for:    
Interest      
Income taxes 313 410
Non-cash transactions:    
Transfer from derivative liability to equity, fair value of warrants exercised 92,282 108,458
Warrant
    
Adjustments to reconcile (loss) income to net cash used in operating activities:    
Stock-based compensation $ 4,232 $ 4,356