Inventory

Inventory consisted of the following at September 30, 2018 and December 31, 2017 (in thousands):



	September 30, 2018		December 31, 2017
Raw materials	$	4,257	$	3,852
Work in process	636		313
Finished goods	653		201
Total inventories	$	5,546	$	4,366

Inventory acquired prior to receipt of the marketing approval for TYMLOS, totaling approximately $1.6 million, was expensed as research and development expense as incurred. The Company began to capitalize the costs associated with the production of TYMLOS upon receipt of FDA approval on April 28, 2017.

Finished goods manufactured by the Company have a 36-month shelf life from date of manufacture.