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Accounts Receivable (Components of Accounts Receivable) (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable [Line Items]
Amounts billed	$ 27,382,357	$ 31,619,504
Amounts unbilled	5,648,578	10,594,598
Total	$ 33,030,935	$ 42,214,102

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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