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INTANGIBLE ASSETS AND GOODWILL
 12 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS AND GOODWILL INTANGIBLE ASSETS AND GOODWILL
The carrying value of intangible assets consisted of the following:
 March 31, 2021March 31, 2020
Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Technology$33,960 $(21,458)$12,502 $33,932 $(16,312)$17,620 
Customer relationships11,969 (7,341)4,628 11,409 (5,412)5,997 
Trade names and domains988 (988)— 983 (599)384 
Total acquired identifiable intangible assets$46,917 $(29,787)$17,130 $46,324 $(22,323)$24,001 
As of March 31, 2021, the weighted average remaining useful life for technology, customer relationship, and trade names and domains was 4.4 years, 5.2 years, and 0.0 years, respectively.
Amortization expense for related intangible assets was $6.9 million, $8.8 million, and $6.2 million for the years ended March 31, 2021, 2020 and 2019, 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, 2021, annual amortization of definite lived intangible assets, based upon existing intangible assets and current useful lives, is estimated to be the following:
 Amount
2022$4,708 
20233,156 
20242,851 
20252,851 
2026 and thereafter3,564 
Total$17,130 
The following table provides a summary of the changes in the carrying amounts of goodwill:
 Total
Balance at March 31, 2019$39,694 
Additions due to acquisitions91,060 
Foreign currency translation(2,454)
Balance at March 31, 2020128,300 
Foreign currency translation3,220 
Balance at March 31, 2021$131,520 
The Company conducted its annual impairment tests of goodwill in the fourth quarters of fiscal years 2021, 2020, and 2019, and determined that no adjustment to the carrying value of goodwill was required.