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Unbilled Receivables	12 Months Ended
Unbilled Receivables	Dec. 31, 2014
Receivables [Abstract]
Unbilled Receivables	6. Unbilled Receivables Unbilled receivables consist of the excess of revenue earned in accordance with generally accepted accounting principles over the amounts billed at contract milestones. Substantially all unbilled receivables are expected to be billed and collected within twelve months.