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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accounts receivable    
Trade receivables $ 8,922 $ 8,539
Less allowance for doubtful accounts (327) (369)
Less allowance for returns (2,066) (1,627)
Accounts receivable, net $ 6,529 $ 6,543