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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Purchased Patents          
Weighted-Average Life     10 years    
Finite-Lived Intangible Assets, Gross     $ 2,292 $ 2,292  
Finite-Lived Patents, Gross     306    
Accumulated Amortization     1,781 1,609  
Amortization expense 57 57     172
Estimated annual aggregate amortization expense through December 31, 2015     229    
Indicators of impairment identified     $ 0 $ 0