Property, Plant and Equipment (Tables)

6 Months Ended

Sep. 30, 2017

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 September 30, 2017 and March 31, 2017 are as follows (in thousands):

	September 30, 2017			March 31, 2017
Land	$	3,643		$	3,643
Construction in progress - equipment	606			601
Buildings	34,549			34,549
Equipment and software	73,798			73,445
Furniture and fixtures	1,154			1,201
Leasehold improvements	1,912			2,442
Property, plant and equipment, gross	115,662			115,881
Less accumulated depreciation	(79,224		)	(72,443		)
Property, plant and equipment, net	$	36,438		$	43,438