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Goodwill and Purchased Intangibles Assets
6 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Purchased Intangibles Assets
Goodwill and Purchased Intangibles Assets
There were no changes to the carrying amount of goodwill for the six months ended September 30, 2017.
Purchased intangible assets subject to amortization as of September 30, 2017 consist of the following (in thousands):
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Developed technology
$
4,900

 
$
(3,195
)
 
$
1,705


Purchased intangible assets subject to amortization as of March 31, 2017 consist of the following (in thousands):
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Developed technology
$
4,900

 
$
(2,401
)
 
$
2,499


Amortization expense of purchased intangible assets was $0.4 million and $0.3 million for the three months ended September 30, 2017 and 2016, respectively, and $0.8 million and $0.5 million for the six months ended September 30, 2017 and 2016, respectively.
Estimated future amortization expense as of September 30, 2017 is as follows (in thousands):
Fiscal Years Ending March 31,
Estimated Future Amortization Expense
2018 (remaining 6 months)
393

2019
787

2020
525

 
$
1,705