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Goodwill and Purchased Intangibles Assets
6 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Purchased Intangibles Assets Goodwill and Purchased Intangibles AssetsThere were no changes to the carrying amount of goodwill for the six months ended September 30, 2020.
Purchased intangible assets subject to amortization as of September 30, 2020 consisted of the following (in thousands):
Gross Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
Developed technology$15,316 $(4,177)$11,139 
Purchased intangible assets subject to amortization as of March 31, 2020 consisted of the following (in thousands):
Gross Carrying
Amount
Accumulated
Amortization
Net Carrying
Amount
Developed technology$15,316 $(1,625)$13,691 
Amortization expense of purchased intangible assets was $1.3 million and $0.5 million for the three months ended September 30, 2020 and 2019, respectively, and $2.6 million and $0.9 million for the six months ended September 30, 2020 and 2019.
Estimated future amortization expense as of September 30, 2020 was as follows (in thousands):
Fiscal Years Ending March 31,Estimated Future Amortization Expense
2021 (remaining six months)$2,553 
20224,619 
20233,967 
$11,139