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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (101,932) $ (142,189)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 119 75
Shares issued for services 18 14
Excess tax benefit from stock-based awards (1,003) (7,960)
Accrued interest payable 7,035 2,508
Amortization of intangible asset 323  
Amortization of debt discount and debt issuance costs 8,740 6,020
Deferred income taxes (4,836)  
Change in lease liability (19) (46)
(Gain) loss on change in fair value of derivative liabilities (22,461) 85,139
Changes in assets and liabilities:    
Restricted cash (1,400)  
Accounts receivable (2,267)  
Other current assets 1,082 (4,596)
Inventory (7,252)  
Other non-current assets (384) (5,533)
Accounts payable and other liabilities 3,313 14,505
Net cash used in operating activities (112,416) (39,122)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of long-term investment   (825)
Purchases of equipment (14) (264)
Net cash used in investing activities (14) (1,089)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options, net of transaction costs 541 6,678
Proceeds from exercise of warrants, net of transaction costs 70 14,930
Excess tax benefit from stock-based awards 1,003 7,960
Proceeds from issuance of exchangeable debt, net of transaction costs   144,316
Payments under capital leases   (20)
Net cash provided by financing activities 1,614 173,864
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (110,816) 133,653
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 260,242 116,602
CASH AND CASH EQUIVALENTS, END OF PERIOD 149,426 250,255
Cash paid during the year for:    
Interest 2,625  
Income taxes 765 313
Non-cash transactions:    
Transfer from derivative liability to equity, fair value of warrants exercised   92,282
Options and Restricted Stock Units
    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 9,963 8,709
Warrant
    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation $ (1,455) $ 4,232