Accounts Receivable	6 Months Ended
Jun. 30, 2012
Accounts Receivable [Abstract]
Accounts Receivable	4. ACCOUNTS RECEIVABLE Accounts receivable are stated at invoiced amount and do not bear interest. Because all accounts receivable are from the U.S. government and historically no amounts have been written off, an allowance for doubtful accounts receivable is not considered necessary. The accounts receivable balance included $4,217,000 and $2,093,000 of U.S. government receivables that were unbilled at June 30, 2012 and December 31, 2011, respectively.

The entire disclosure of the amount due to the entity within one year of the balance sheet (or operating cycle if longer) from outside sources , including trade accounts receivable, notes and loan receivable , as well as any other types of receivables, including unbilled receivables that have been shipped or where performance is complete but not yet billed and are recognized in conformity with revenue recognition criteria, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Unbilled accounts receivable are related to contract transactions.

No definition available.

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