INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS

12 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS

The carrying value of intangible assets consisted of the following (in thousands):



	March 31, 2020							March 31, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Technology	$	33,932	$	(16,312	)	$	17,620	$	25,702	$	(15,409	)	$	10,293
Customer relationships	11,409		(5,412		)	5,997		9,467		(8,080		)	1,387
Trade names and domains	983		(599		)	384		2,108		(2,108		)	—
In-process research and development	—		—			—		95		(95		)	—
Total acquired identifiable intangible assets	$	46,324	$	(22,323	)	$	24,001	$	37,372	$	(25,692	)	$	11,680

As of March 31, 2020, the weighted average remaining useful life for technology, customer relationship, and trade names and domains was 4.9 years, 5.8 years, and 0.1 years, respectively.

Amortization expense for related intangible assets was $8.8 million, $6.2 million, and $5.0 million for the years ended March 31, 2020, 2019 and 2018, respectively.

During the year ended March 31, 2020, the Company wrote off approximately $11.3 million of fully amortized intangible assets and the corresponding accumulated amortization.

At March 31, 2020, annual amortization of definite lived intangible assets, based upon existing intangible assets and current useful lives, is estimated to be the following (in thousands):



	Amount
2021	$	6,871
2022	4,708
2023	3,156
2024	2,851
2025 and thereafter	6,415
Total	$	24,001

The following table provides a summary of the changes in the carrying amounts of goodwill (in thousands):



	Total
Balance at March 31, 2018	$	40,054
Additions due to acquisitions	500
Foreign currency translation	(860		)
Balance at March 31, 2019	39,694
Additions due to acquisitions	91,060
Foreign currency translation	(2,454		)
Balance at March 31, 2020	$	128,300

Deferred Sales Commission Costs

Amortization of deferred sales commission costs for the year ended March 31, 2020 and 2019 was $19.5 million and $14.2 million, respectively. Prior to the adoption of ASC 606, the Company did not defer sales commission costs. There were no material write-offs relative to the costs capitalized for the year ended March 31, 2020 and 2019.