Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Intangible assets          
Net amount $ 928   $ 928   $ 1,002
Product formulations
          
Intangible assets          
Gross carrying amount 1,763   1,763   1,763
Accumulated amortization 835   835   761
Net amount 928   928   1,002
Amortization expense for intangible assets 37 37 74 74  
Estimated amortization expense          
2013 149   149    
2014 149   149    
2015 149   149    
2016 91   91    
2017 $ 91   $ 91    
Product formulations | Minimum
          
Intangible assets          
Estimated useful lives     9 years    
Product formulations | Maximum
          
Intangible assets          
Estimated useful lives     15 years