Property, Plant and Equipment (Tables)

3 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Schedule of Costs and Accumulated Depreciation of 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