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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 58,201 $ 26,696
Accounts receivable 5,868 4,444
Inventories 12,762 10,180
Prepaid expenses 739 638
Other current assets 200 2,038
Total current assets 77,770 43,996
Non-current assets:    
Property and equipment, net 1,641 1,698
Goodwill 1,316 1,316
Intangible assets, net 1,445 1,546
Restricted cash 304 304
Other assets 72 59
Total assets 82,548 48,919
Current liabilities:    
Accounts payable 5,035 7,186
Accrued liabilities 8,748 7,619
Deferred revenue 153 77
Debt - current 2,157 4,828
Warrant liability 10,290 5,903
Total current liabilities 26,383 25,613
Non-current liabilities:    
Debt - non-current 0 2,896
Deferred income taxes 75 62
Other non-current liabilities 1,145 1,241
Total liabilities 27,603 29,812
Commitments and contingencies      
Common stock 70 56
Additional paid-in capital 531,703 478,903
Accumulated deficit (476,828) (459,852)
Total stockholders' equity 54,945 19,107
Total liabilities and stockholders' equity $ 82,548 $ 48,919