ACCOUNTS RECEIVABLE NET

12 Months Ended

Dec. 31, 2012

ACCOUNTS RECEIVABLE NET

ACCOUNTS RECEIVABLE NET

4.    ACCOUNTS RECEIVABLE NET

Accounts receivable, net consists of the following:

	December 31,
	2012			2011
Trade receivables	$	50,876		$	35,482
Unbilled revenue		12,372			6,347
Other receivables		6,198			1,250
		69,446			43,079
Less: Allowance for doubtful accounts		(287	)		(359	)
Accounts receivable, net	$	69,159		$	42,720

Under long-term contract accounting unbilled revenue on long-term contracts arise when the sales or revenues based on performance attainment, though appropriately recognized, cannot be billed yet under terms of the contract as of the balance sheet date. Accounts receivable expected to be collected after one year are not material.