Inventory (Notes)

6 Months Ended

Jun. 30, 2017

Inventories

Inventories consist of the following:



	June 30,		December 31,
	2017		2016
Raw materials	$	170,273	$	92,287
Work-in-process	162,718		202,301
Finished goods	33,021		13,334
Deferred costs	188,308		91,434
	$	554,320	$	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 June 30, 2017 and 2016, cost of goods sold included inventory write-offs and reserves totaling $2.7 million and $2.0 million, respectively. For the six months ended June 30, 2017 and 2016, cost of goods sold included inventory write-offs and reserves totaling $9.1 million and $6.3 million, respectively.