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Balance Sheet Details -Inventories, net (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Raw materials $ 2,009,691 $ 2,016,032
Work in process 1,869,830 1,984,368
Finished goods 1,606,851 1,760,640
Valuation reserves 550,000 549,000
Inventories, net $ 4,936,372 $ 5,212,040