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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (179,184) $ (69,126) $ (249,589)
Adjustments to reconcile loss to net cash used in operating activities:      
Depreciation and amortization 180 76 63
Stock-based compensation 18,075 9,294 5,207
Excess tax benefit from stock-based awards (11,334) (4,199) (543)
Accrued interest payable 2,520    
Amortization of debt discount and debt issuance costs 12,856    
Amortization of Intangible Asset 269    
Foreign exchange loss on Intangible Asset 519    
Loss on changes in fair value of derivative liabilities 35,344 22,669 205,153
Deferred income taxes (3,714) (2,493) (1,691)
Change in lease liability (50) (21) (583)
Shares issued for services 32 71 12
Changes in assets and liabilities:      
Other current assets (1,416) (774) 912
Inventory (21,262)    
Other non-current assets (1,060) (591)  
Accounts payable and other current liabilities 25,675 5,751 1,476
Net cash used in operating activities (122,303) (39,439) (33,870)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of equipment (549) (398) (23)
Purchase of long term investment (1,650) (1,650)  
Laxdale Intangible Asset (12,143)    
Net cash used in investing activities (14,342) (2,048) (23)
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 8,205 5,094 3,642
Proceeds from exercise of warrants, net of transaction costs 16,720 18,702 8,904
Proceeds on issuance of exchangeable senior notes, net of transaction costs 144,316    
Proceeds from long term debt, net of transaction costs 99,730    
Excess tax benefit from stock-based awards 11,334 4,199 543
Repayment of capital leases (20) (2) (12)
Net cash provided by financing activities 280,285 126,647 13,077
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 143,640 85,160 (20,816)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 116,602 31,442 52,258
CASH AND CASH EQUIVALENTS, END OF PERIOD 260,242 116,602 31,442
Cash paid during the year for:      
Interest 2,713   2
Income taxes 1,118 761 230
Supplemental disclosure of non-cash items:      
Reclass of warrant liability to additional paid-in capital 103,885 129,517 22,317
Warrant
      
Adjustments to reconcile loss to net cash used in operating activities:      
Stock-based compensation $ 247 $ (96) $ 5,713