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FIXED ASSETS
 12 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
FIXED ASSETS
FIXED ASSETS
Fixed assets consist of the following (in thousands):
 
 
 
 
 
 
 
Estimated Useful Life in Years
 
March 31,
 
 
2017
 
2016
Furniture and fixtures
3-7
 
$
6,436

 
$
5,843

Computer equipment and internal use software
3-5
 
135,100

 
118,974

Demonstration and spare part units
2-5
 
28,036

 
6,860

Leasehold improvements (1)
 up to 12
 
16,623

 
22,490

 
 
 
186,195

 
154,167

Less – accumulated depreciation
 
 
(124,802
)
 
(92,134
)
 
 
 
$
61,393

 
$
62,033


(1) Leasehold improvements are depreciated over the shorter of the lease term or anticipated useful life of the improvement.
Depreciation expense was $33.0 million, $26.6 million and $12.6 million for the years ended March 31, 2017, 2016 and 2015, respectively.