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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 29,485 $ 26,696
Short-term investments 28,191  
Accounts receivable, net of allowance of $0 at December 31, 2013 and 2012 6,125 4,444
Inventories 13,063 10,180
Prepaid expenses 848 638
Other current assets 442 2,038
Total current assets 78,154 43,996
Non-current assets:    
Property and equipment, net 2,189 1,698
Goodwill 1,316 1,316
Intangible assets, net 1,344 1,546
Restricted cash 308 304
Other assets 70 59
Total assets 83,381 48,919
Current liabilities:    
Accounts payable 5,674 7,186
Accrued liabilities 9,813 7,619
Deferred revenue 181 77
Debt-current 3,366 4,828
Warrant liability 20,390 5,903
Total current liabilities 39,424 25,613
Non-current liabilities:    
Debt-non-current   2,896
Deferred income taxes 89 62
Other non-current liabilities 1,073 1,241
Total liabilities 40,586 29,812
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.001 par value 5,000 shares authorized, issuable in series; 0 shares issued and outstanding at December 31, 2013 and 2012      
Common stock, $0.001 par value 112,500 shares authorized; 71,859 and 56,252 shares issued and outstanding at December 31, 2013 and 2012, respectively 72 56
Additional paid-in capital 545,905 478,903
Accumulated other comprehensive income 7  
Accumulated deficit (503,189) (459,852)
Total stockholders' equity 42,795 19,107
Total liabilities and stockholders' equity $ 83,381 $ 48,919