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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Activity of allowance for doubtful accounts
Beginning balance	$ 378	$ 194
Charges to costs and expenses	(260)	1,873
Accounts charged off, less recoveries	(4)	(1,689)
Ending balance	$ 114	$ 378

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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