6. Inventories

Inventories consist of work in process and finished goods related to the manufacture of GALAFOLD. The following table summarizes the components of inventories at December 31, 2017 (in thousands):

	December 31, 2017		December 31, 2016
Work-in-process	$	3,843	$	3,308
Finished goods		780		108

Total inventories	$	4,623	$	3,416

Inventory manufactured prior to approval was expensed to research and development. Inventories are reviewed periodically to identify slow-moving or obsolete inventory based on projected sales activity, as well as product shelf-life. In evaluating the recoverability of inventories produced, the Company considers the probability that revenue will be obtained from the future sale of the related inventory. Inventory becomes obsolete when it has aged past its shelf-life, cannot be recertified and is no longer usable or able to be sold, or the inventory has been damaged. In such instances, a full reserve would be taken against such inventory. Expired inventory is disposed of and the related costs are recognized as cost of product sales in the consolidated statement of operations. There have been no write-downs of inventory from the time inventory was first capitalized nor have any inventory reserves been recorded to date.