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3. Accounts Receivable, net (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts Receivable Net    
Accounts receivable - trade $ 2,722 $ 2,062
Allowance for doubtful accounts (116) (230)
Accounts receivable, net $ 2,606 $ 1,832