Patents (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

Amortizable intangible assets:	June 30, 2012		December 31, 2011
	Carrying Amount	Accumulated Amortization	Carrying Amount	Accumulated Amortization
Patents	$ 6,746	(4,909)	$ 6,746	$ (4,726)
Capitalized software	4,112	(4,109)	4,112	(4,034)
Total	$ 10,858	$ (9,018)	$ 10,858	$ (8,760)

Schedule of amortization for intangible assets

Remainder of 2012	$ 185
2013	365
2014	357
2015	342
2016	322
Thereafter	269
Total	$ 1,840