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Inventory
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventory
Inventory
Inventory, which was included in prepaid expenses and other current assets in the Company's balance sheets, consists of the following:
 
September 30,
 
December 31,
 
2013
 
2012
Raw materials
$
5,225

 
$
4,862

Work-in-process
34,837

 
14,656

Finished goods
12,322

 
2,570

Deferred costs
10,908

 
6,550

 
$
63,292

 
$
28,638



Deferred costs represent the costs of product manufactured and shipped to the Company's collaborators for which recognition of revenue has been deferred.
As of September 30, 2013 and December 31, 2012, inventory included reserves of $5.1 million and $3.6 million, respectively. For the nine months ended September 30, 2013 and 2012, cost of goods sold included inventory write-downs and reserves totaling $4.8 million and $8.6 million, respectively. For the three months ended September 30, 2013 and 2012, inventory write-downs and reserves included in cost of goods sold were not material.