5. Inventory

Our inventory balance consists of the following:


	September 30,		December 31,
	2015		2014
	(in thousands)

Raw materials	$	283	$	591
Work-in-process		17,555		18,487
Finished goods		2,428		358
		20,266		19,436
Inventories-current		2,428		358
Inventories-non-current	$	17,838	$	19,078

Inventories, stated at the lower of cost or market, consist of raw materials, work in process and finished goods. At September 30, 2015, $2.4 million of inventory was classified as current on the condensed consolidated balance sheet as we expect this inventory to be consumed for commercial use within the next twelve months. At September 30, 2015, $17.8 million of inventory was classified as non-current on the condensed consolidated balance sheet as we did not expect this inventory to be consumed for commercial use within the next twelve months. We obtain a number of inventory components from single source suppliers due to technology, availability, price, quality or other considerations. The loss of a single source supplier, the deterioration of its relationship with a single source supplier, or any unilateral violation of the contractual terms under which we are supplied components by a single source supplier could adversely affect our total revenues and gross margins.

The raw materials and work-in-process inventory is not subject to expiration and the shelf life for finished goods inventory is 36 months from the start of manufacturing of the finished goods. We evaluate for potential excess inventory by analyzing current and future product demand relative to the remaining product shelf life. We build demand forecasts by considering factors such as, but not limited to, overall market potential, market share, market acceptance and patient usage.