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FIXED ASSETS
 12 Months Ended
Mar. 31, 2016
Property, Plant and Equipment [Abstract]  
FIXED ASSETS
FIXED ASSETS
Fixed assets consist of the following (in thousands):
 
 
 
 
 
 
 
Estimated Useful Life in Years
 
March 31,
 
 
2016
 
2015
Furniture and fixtures
3-7
 
$
5,843

 
$
3,739

Computer equipment and internal use software
3-5
 
118,974

 
69,259

Demonstration and spare part units
2-5
 
6,860

 
12,092

Leasehold improvements (1)
 up to 12
 
22,490

 
14,709

 
 
 
154,167

 
99,799

Less – accumulated depreciation
 
 
(92,134
)
 
(75,935
)
 
 
 
$
62,033

 
$
23,864


(1) Leasehold improvements are depreciated over the shorter of the lease term or anticipated useful life of the improvement.
Depreciation expense was $26.6 million, $12.6 million and $11.4 million for the years ended March 31, 2016, 2015 and 2014, respectively.