Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 1,824	$ 1,837
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	20,000,000	10,000,000
Common stock, shares issued	7,277,982	7,246,933
Treasury stock at cost, common shares held	289,806	288,681

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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