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Property, Plant and Equipment
 6 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, 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


Depreciation expense was $3.2 million and $7.5 million for the three and six months ended September 30, 2017. Depreciation expense was $1.7 million and $3.5 million for the three and six months ended September 30, 2016. Included in depreciation expense for the three and six months ended September 30, 2017 is $1.6 million and $4.1 million, respectively, of accelerated depreciation recorded to cost of revenues related to revised estimates of the remaining useful lives of certain pieces of manufacturing equipment.