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Summary of Significant Accounting Policies - Allowance For Doubtful Accounts Rollforward (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts receivable [Roll Forward]
Beginning balance	$ 623,000	$ 592,000	$ 844,000
Additions charged to expense	535,617	275,526	280,578
Deductions (write-offs/recoveries) from reserve	(230,000)	(245,000)	(533,000)
Ending balance	$ 929,000	$ 623,000	$ 592,000

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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