Property, Plant and Equipment

3 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at June 30, 2018 and March 31, 2018 are as follows (in thousands):

	June 30, 2018			March 31, 2018
Construction in progress - equipment	528			654
Equipment and software	72,466			72,760
Furniture and fixtures	1,890			1,878
Leasehold improvements	1,632			1,426
Property, plant and equipment, gross	76,516			76,718
Less accumulated depreciation	(64,962		)	(64,205		)
Property, plant and equipment, net	$	11,554		$	12,513

Depreciation expense was $1.1 million and $4.2 million for the three months ended June 30, 2018 and 2017, respectively. Included in depreciation expense for the three months ended June 30, 2017 is $2.5 million of accelerated depreciation recorded to cost of revenues related to revised estimates of the remaining useful lives of certain pieces of manufacturing equipment. Construction in progress - equipment primarily includes capital investments in the Company's newly leased facility in Ayer, Massachusetts.