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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (10,657) $ (101,932)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 107 119
Excess tax benefit from stock-based awards (1) (1,003)
Accrued interest payable 1,696 7,035
Amortization of debt discount and debt issuance costs 2,267 8,740
Amortization of intangible asset 323 323
Gain on changes in fair value of derivative liabilities (7,404) (22,461)
Gain on extinguishment of debt (38,034)  
Deferred income taxes 7 (4,836)
Shares issued for services   18
Change in lease liability   (19)
Changes in assets and liabilities:    
Restricted cash 400 (1,400)
Accounts receivable (2,719) (2,267)
Inventories 9,548 (7,252)
Other current assets (1,312) 1,082
Other non-current assets 1,722 (384)
Deferred revenue (1,703)  
Accounts payable and other current liabilities 2,779 3,313
Net cash used in operating activities (38,807) (112,416)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment   (14)
Net cash used in investing activities   (14)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options, net of transaction costs 284 541
Proceeds from exercise of warrants, net of transaction costs   70
Debt issuance costs (2,425)  
Excess tax benefit from stock-based awards 1 1,003
Payments under capital leases (39)  
Net cash (used in) provided by financing activities (2,179) 1,614
NET DECREASE IN CASH AND CASH EQUIVALENTS (40,986) (110,816)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 191,514 260,242
CASH AND CASH EQUIVALENTS, END OF PERIOD 150,528 149,426
Cash paid during the year for:    
Interest 4,732 2,625
Income taxes 414 765
Supplemental disclosure of non-cash items:    
Reacquisition of conversion option in convertible notes 10,100  
Options and Restricted Stock Units
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation 4,351 9,963
Warrant
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ (177) $ (1,455)