Goodwill and Purchased Intangibles Assets

9 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Purchased Intangibles Assets

The changes in the carrying amount of goodwill for the nine months ended December 31, 2018 consist of the following (in thousands):



Goodwill as of March 31, 2018	$	11,828
Goodwill acquired	3,506
Goodwill as of December 31, 2018	$	15,334

Purchased intangible assets subject to amortization as of December 31, 2018 consist of the following (in thousands):



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	7,816	$	(4,422	)	$	3,394

Purchased intangible assets subject to amortization as of March 31, 2018 consist of the following (in thousands):



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed technology	$	4,900	$	(3,588	)	$	1,312

Amortization expense of purchased intangible assets was $0.4 million and $0.2 million for the three months ended December 31, 2018 and 2017, respectively, and $0.8 million and $1.0 million for the nine months ended December 31, 2018 and 2017, respectively.

Estimated future amortization expense as of December 31, 2018 is as follows (in thousands):



Fiscal Years Ending March 31,	Estimated Future Amortization Expense
2019 (remaining 3 months)	$	440
2020	1,496
2021	972
2022	486
	$	3,394