Variable Interest Entity (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Noncontrolling Interest [Line Items]        
Cash and cash equivalents $ 722 $ 3,986 $ 5,897 $ 3,030
Accounts receivable trade, net 1,697 1,414    
Inventories, net 4,917 3,816    
Prepaid expenses and other current assets 506 926    
Total current assets 8,582 14,696    
Property and equipment, net 780 941    
Intangible and other assets, net 371 432    
Total assets 9,733 16,069    
Revolving line of credit 0 583    
Current portion of term loan 779 753    
Accounts payable 5,095 2,323    
Accrued liabilities 2,117 2,357    
Total current liabilities 10,292 10,992    
Long-term portion of term loan 4,476 5,064    
Other long-term liabilities 837 726    
Total liabilities 15,605 16,782    
N2 Biomedical LLC
        
Noncontrolling Interest [Line Items]        
Cash and cash equivalents 445 131    
Accounts receivable trade, net 1,063 899    
Due from related parties 0 24    
Inventories, net 61 22    
Prepaid expenses and other current assets 129 114    
Total current assets 1,698 1,190    
Property and equipment, net 282 266    
Intangible and other assets, net 78 85    
Total assets 2,058 1,541    
Revolving line of credit 0 438    
Current portion of term loan 779 753    
Accounts payable 97 144    
Due to Related Parties 36 0    
Accrued liabilities 237 169    
Total current liabilities 1,149 1,504    
Long-term portion of term loan 4,476 5,064    
Long-term note payable to related party 2,400 2,400    
Other long-term liabilities 42 12    
Total liabilities $ 8,067 $ 8,980