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Property, Plant and Equipment
 9 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
The cost and accumulated depreciation of property and equipment at December 31, 2018 and March 31, 2018 are as follows (in thousands):
 
December 31,
2018
 
March 31,
2018
Construction in progress - equipment
632

 
654

Equipment and software
45,747

 
72,760

Furniture and fixtures
1,308

 
1,878

Leasehold improvements
1,955

 
1,426

Property, plant and equipment, gross
49,642

 
76,718

Less accumulated depreciation
(39,834
)
 
(64,205
)
Property, plant and equipment, net
$
9,808

 
$
12,513


Depreciation expense was $1.1 million and $1.4 million for the three months ended December 31, 2018 and 2017, respectively. Depreciation expense was $3.2 million and $8.9 million for the nine months ended December 31, 2018 and 2017, respectively. Included in depreciation expense for the nine months ended December 31, 2017 is $4.1 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 and leasehold improvements in the Company's leased facility in Ayer, Massachusetts.