Variable Interest Entity Variable Interest Entity Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Current assets        
Cash and cash equivalents, end of period $ 3,986 $ 3,030 $ 3,030 $ 4,758
Accounts receivable – trade, net 1,414 2,137    
Inventories, net 3,816 5,316    
Prepaid expenses and other current assets 926 617    
Total current assets 14,696 12,072    
Property and equipment, net 941 1,197    
Intangible and other assets, net 432 393    
Total assets 16,069 16,625    
Current liabilities        
Current portion of term loan 753 0    
Accounts payable 2,323 1,424    
Accrued liabilities 2,336 2,221    
Total current liabilities 10,992 5,456    
Long-term portion of term loan 5,064 0    
Other long-term liabilities 726 746    
Total liabilities 16,782 9,173    
N2 Biomedical LLC
        
Current assets        
Cash and cash equivalents, end of period 131      
Accounts receivable – trade, net 899      
Due from Related Parties 24      
Inventories, net 22      
Prepaid expenses and other current assets 114      
Total current assets 1,190      
Property and equipment, net 266      
Intangible and other assets, net 85      
Total assets 1,541      
Current liabilities        
Current portion of term loan 753      
Revolving line of credit 438      
Accounts payable 144      
Accrued liabilities 169      
Total current liabilities 1,504      
Long-term portion of term loan 5,064      
Long-term note payable to related party 2,400      
Other long-term liabilities 12      
Total liabilities $ 8,980