Inventory (Notes)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventory

Inventories

Inventories consist of the following:

	March 31,		December 31,
	2017		2016
Raw materials	$	127,637	$	92,287
Work-in-process	173,469		202,301
Finished goods	20,259		13,334
Deferred costs	145,211		91,434
	$	466,576	$	399,356

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, 2017 and 2016, cost of goods sold included inventory write-downs and reserves totaling $6.4 million and $4.3 million, respectively.