3. INVENTORIES

Inventories consist of raw materials, work-in-process and finished goods related to the manufacture of PROCYSBI and QUINSAIR. Raw materials include the active pharmaceutical ingredients (“API”), cysteamine bitartrate and Levofloxacin, for PROCYSBI and QUINSAIR, respectively. Work-in-process includes third party manufacturing and associated labor costs relating to the Company's personnel directly involved in the production process of both products. Also included in inventories are raw materials that may be used for clinical trials, which are charged to research and development (“R&D”) expense when consumed.

The following table summarizes the components of inventories.

	March 31,		December 31,
(In thousands)	2016		2015
Raw materials	$	3,153	$	2,681
Work-in-process		2,621		1,824
Finished goods		3,822		1,919
Total Inventories	$	9,596	$	6,424