Inventory (Notes)

3 Months Ended

Mar. 31, 2016

Inventories

Inventories consist of the following:



	March 31,		December 31,
	2016		2015
Raw materials	$	85,180	$	59,151
Work-in-process	157,921		132,068
Finished goods	14,231		11,197
Deferred costs	45,962		36,162
	$	303,294	$	238,578

Deferred costs represent the costs of product manufactured and shipped to the Company's collaborators for which recognition of revenue has been deferred. For the three months ended March 31, 2016 and 2015, cost of goods sold included inventory write-downs and reserves totaling $4.3 million and $1.7 million, respectively.