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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (36,707) $ (150,816)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 155 179
Excess tax benefit from stock-based awards (1) (966)
Current portion of long-term debt 816 8,381
Amortization of debt discount and debt issuance costs 4,039 13,232
Amortization of intangible asset 484 485
Gain on changes in fair value of derivative liabilities (11,870) (21,059)
Gain on extinguishment of debt (38,034)  
Deferred income taxes 82 (6,389)
Shares issued for services   27
Change in lease liability   3
Changes in assets and liabilities:    
Restricted cash 400 (1,400)
Accounts receivable (3,022) (3,721)
Inventories 14,805 (5,821)
Other current assets (1,371) (283)
Other non-current assets 2,017 (384)
Deferred revenue (1,703)  
Accounts payable and other current liabilities 5,456 (1,714)
Net cash used in operating activities (58,685) (157,255)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment   (14)
Net cash used in investing activities   (14)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs   121,206
Refund of equity issuance costs 3,191  
Proceeds from exercise of stock options, net of transaction costs 307 627
Proceeds from exercise of warrants, net of transaction costs 1,651 120
Debt issuance costs (2,480)  
Excess tax benefit from stock-based awards 1 966
Payments under capital leases (64) (7)
Net cash provided by financing activities 2,606 122,912
NET DECREASE IN CASH AND CASH EQUIVALENTS (56,079) (34,357)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 191,514 260,242
CASH AND CASH EQUIVALENTS, END OF PERIOD 135,435 225,885
Cash paid during the year for:    
Interest 8,622 5,250
Income taxes 581 1,395
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 6,272 14,170
Warrant
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ (503) $ (1,179)