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Inventory

3 Months Ended

Mar. 31, 2013

Inventories, which were included in prepaid expenses and other current assets in the Company's balance sheets, consist of the following:



	March 31,		December 31,
	2013		2012
Raw materials	$	6,315	$	4,862
Work in process	25,061		14,656
Finished goods	6,390		2,570
Deferred costs	6,211		6,550
	$	43,977	$	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 March 31, 2013 and December 31, 2012, the inventory balance included reserves of $4.6 million and $3.6 million, respectively. For the three months ended March 31, 2013 and 2012, cost of goods sold included inventory write-downs and reserves totaling $3.2 million and $1.9 million, respectively.

- Definition

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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