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Summary of Significant Accounting Policies - Rollforward Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of the year	$ 149	$ 206
Charged to costs and expenses	25	312
Deductions	(114)	(369)
Balance at the end of the year	$ 60	$ 149

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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