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Accounts Payable (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Payable and Accrued Expenses and Other Current Liabilities [Abstract]

Summary of accounts payable

Accounts payable at December 31 are summarized below:

		2012				2011
External services		$	678,813			$	716,904
Supplies			216,900				206,863
Other			103,652				142,728
Total accounts payable		$	999,365			$	1,066,495

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- Definition

Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses.

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