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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Activity of allowance for doubtful accounts
Beginning balance	$ 286	$ 378
Charges to costs and expenses	99	(54)
Accounts charged off, less recoveries	(130)	(38)
Ending balance	$ 255	$ 286

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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