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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 69,163 $ 26,696
Accounts receivable 4,733 4,444
Inventories 11,756 10,180
Prepaid expenses 1,370 638
Other current assets 418 2,038
Total current assets 87,440 43,996
Non-current assets:    
Property and equipment, net 1,595 1,698
Goodwill 1,316 1,316
Intangible assets, net 1,496 1,546
Restricted cash 302 304
Other assets 58 59
Total assets 92,207 48,919
Current liabilities:    
Accounts payable 3,887 7,186
Accrued liabilities 8,149 7,619
Deferred revenue 174 77
Debt - current 4,470 4,828
Warrant liability 10,976 5,903
Total current liabilities 27,656 25,613
Non-current liabilities:    
Debt - non-current 2,485 2,896
Deferred income taxes 69 62
Other non-current liabilities 1,209 1,241
Total liabilities 31,419 29,812
Commitments and contingencies      
Stockholders' equity:    
Common stock 70 56
Additional paid-in capital 530,822 478,903
Accumulated deficit (470,104) (459,852)
Total stockholders' equity 60,788 19,107
Total liabilities and stockholders' equity $ 92,207 $ 48,919