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Patents (Tables)
 6 Months Ended
Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Intangible Assets
Amortizable intangible assets:June 30, 2013December 31, 2012
Carrying
Amount		Accumulated
Amortization		Carrying
Amount		Accumulative
Amortization
Patents
$
6,746
$
(5,274)
$
6,746
$
(5,091)