Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

When performance obligations are not transferred to a customer at the end of a reporting period, the amount allocated to those performance obligations are deferred until control of these performance obligations is transferred to the customer. The following table presents the rollforward of the contract liabilities, which is included in the Company's current and long-term deferred revenue line items in the condensed consolidated balance sheets:

(in thousands)
Balance at December 31, 2017	$	30,491
Adoption of new accounting standard (ASC 606)		42,379
Balance at January 1, 2018		72,870
Deferral of revenue		15,478
Recognition of revenue included in beginning of year contract liability		(15,343	)
Balance at June 30, 2018	$	73,005

Disaggregation of Revenue

We operate in one business segment. Therefore, results of our operations are reported on a consolidated basis for purposes of segment reporting, consistent with internal management reporting. For the three and six months ended June 30, 2018, there was a nominal difference between revenues recognized under ASC 606 and revenues recognized based on the prior revenue recognition guidance for the same period. For the three and six months ended June 30, 2018, the Company's revenues disaggregated by the major sources was as follows:

(in thousands)	Three Months Ended June 30, 2018						Six Months Ended June 30, 2018
	U.S		Non-U.S.				U.S		Non-U.S.
	Government		Government		Total		Government		Government		Total

Product sales	$	169,897	$	10,178	$	180,075	$	235,922	$	19,924	$	255,846
Contract manufacturing		-		23,613		23,613		-		49,791		49,791
Contracts and grants		15,250		1,262		16,512		30,055		2,322		32,377
Total revenues	$	185,147	$	35,053	$	220,200	$	265,977	$	72,037	$	338,014