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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (62,158) $ (88,285)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 59 32
Stock-based compensation 4,874 3,874
Excess tax benefit from stock-based awards (678) (1,884)
Accrued interest payable 2,124 1,196
Amortization of debt discount and debt issuance costs 4,204  
Amortization of Intangible Asset 161  
(Gain) loss on changes in fair value of derivative liabilities (3,620) 66,209
Deferred income taxes (3,949)  
Shares issued for services 8 6
Change in lease liability (7) (8)
Changes in assets and liabilities:    
Restricted cash (1,400)  
Accounts receivable (3,441)  
Inventories (6,173)  
Other current assets (3,798) (3,131)
Other non-current assets (383) (2,050)
Accounts payable and other liabilities 14,993 1,137
Other non-current liabilities   2,793
Net cash used in operating activities (59,635) (17,737)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (14) (92)
Net cash used in investing activities (14) (92)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options, net of transaction costs 439 791
Proceeds from exercise of warrants, net of transaction costs 70 59
Proceeds from issuance of senior notes, net of transaction costs   144,316
Excess tax benefit from stock-based awards 678 1,884
Payments under capital leases   (1)
Net cash provided by financing activities 1,187 147,049
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (58,462) 129,220
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 260,242 116,602
CASH AND CASH EQUIVALENTS, END OF PERIOD 201,780 245,822
Cash paid during the year for:    
Interest 2,625  
Income taxes 563 111
Non-cash transactions:    
Reclass of derivative warrant liability to additional paid-in capital 0 321
Warrant
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ (451) $ 2,374