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Property, Plant and Equipment
 6 Months Ended
Sep. 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 September 30, 2018 and March 31, 2018 are as follows (in thousands):
 
September 30,
2018
 
March 31,
2018
Construction in progress - equipment
597

 
654

Equipment and software
45,797

 
72,760

Furniture and fixtures
1,307

 
1,878

Leasehold improvements
1,838

 
1,426

Property, plant and equipment, gross
49,539

 
76,718

Less accumulated depreciation
(38,957
)
 
(64,205
)
Property, plant and equipment, net
$
10,582

 
$
12,513


Depreciation expense was $1.1 million and $3.2 million for the three months ended September 30, 2018 and 2017, respectively. Depreciation expense was $2.1 million and $7.5 million for the six months ended September 30, 2018 and 2017, respectively. 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. Construction in progress - equipment primarily includes capital investments in the Company's newly leased facility in Ayer, Massachusetts.