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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (150,816) $ (168,617)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 179 123
Shares issued for services 27 24
Excess tax benefit from stock-based awards (966) (10,106)
Accrued interest payable 8,381 1,094
Amortization of intangible asset 485 108
Amortization of debt discount and debt issuance costs 13,232 9,365
Deferred income taxes (6,389)  
Change in lease liability 3 (55)
(Gain) loss on change in fair value of derivative liabilities (21,059) 68,686
Changes in assets and liabilities:    
Restricted cash (1,400)  
Accounts receivable (3,721)  
Inventory (5,821) (8,989)
Other current assets (283) (2,273)
Other non-current assets (384) (17,355)
Accounts payable, accrued expenses and other liabilities (1,714) 33,075
Net cash used in operating activities (157,255) (78,539)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of long-term investment   (1,238)
Purchases of equipment (14) (477)
Net cash used in investing activities (14) (1,715)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs 121,206  
Proceeds from exercise of stock options, net of transaction costs 627 7,834
Proceeds from exercise of warrants, net of transaction costs 120 16,526
Excess tax benefit from stock-based awards 966 10,106
Proceeds from issuance of exchangeable debt, net of transaction costs   144,316
Payments under capital leases (7) (20)
Net cash provided by financing activities 122,912 178,762
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (34,357) 98,508
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 260,242 116,602
CASH AND CASH EQUIVALENTS, END OF PERIOD 225,885 215,110
Cash paid during the year for:    
Interest 5,250 2,713
Income taxes 1,395 697
Non-cash transactions:    
Transfer from derivative liability to equity, fair value of warrants exercised   103,885
Options and Restricted Stock Units
    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 14,170 13,344
Warrant
    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation $ (1,179) $ 3,037