4.	Inventories

Inventories consist primarily of telecommunications systems and parts, and are recorded at the lower of cost (average cost) or market. We evaluate the need for write-downs associated with obsolete, slow-moving, and nonsalable inventory by reviewing net realizable inventory values on a periodic basis.

Inventories as of March 31, 2016 and December 31, 2015, all of which were included within the BA segment, were as follows (in thousands):


	March 31,		December 31,
	2016		2015
Work-in-process component parts	$	14,142	$	13,866
Finished goods		7,828		7,071

Total inventory	$	21,970	$	20,937