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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (25,980) $ (62,158)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 56 59
Excess tax provision (benefit) from stock-based awards 1 (678)
Accrued interest payable (405) 2,124
Amortization of debt discount and debt issuance costs 1,173 4,204
Amortization of intangible asset 161 161
Gain on changes in fair value of derivative liabilities (4,393) (3,620)
Deferred income taxes (24) (3,949)
Shares issued for services   8
Change in lease liability   (7)
Changes in assets and liabilities:    
Restricted cash 400 (1,400)
Accounts receivable (380) (3,441)
Inventories 4,861 (6,173)
Other current assets (1,380) (3,798)
Other non-current assets 1,339 (383)
Deferred revenue (1,703) 2,865
Accounts payable and other liabilities (3,105) 12,128
Net cash used in operating activities (27,494) (59,635)
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 285 439
Proceeds from exercise of warrants, net of transaction costs   70
Excess tax (provision) benefit from stock-based awards (1) 678
Payments under capital leases (26)  
Net cash provided by financing activities 258 1,187
NET DECREASE IN CASH AND CASH EQUIVALENTS (27,236) (58,462)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 191,514 260,242
CASH AND CASH EQUIVALENTS, END OF PERIOD 164,278 201,780
Cash paid during the year for:    
Interest 3,636 2,625
Income taxes 33 563
Options and Restricted Stock Units
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation 1,957 4,874
Warrant
    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ (72) $ (451)