INTANGIBLE ASSETS, GOODWILL AND OTHER ASSETS

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



	March 31, 2019							March 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Technology	$	25,702	$	(15,409	)	$	10,293	$	19,702	$	(10,535	)	$	9,167
Customer relationships	9,467		(8,080		)	1,387		9,776		(7,366		)	2,410
Trade names/domains	2,108		(2,108		)	—		2,108		(1,727		)	381
Total acquired identifiable intangible assets	$	37,372	$	(25,692	)	$	11,680	$	31,681	$	(19,723	)	$	11,958

At March 31, 2019, 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
2020	$	6,116
2021	3,569
2022	1,766
2023	229
Total	$	11,680

Impairment of Long-Lived Assets and Goodwill

During the third quarter of fiscal year 2018, the Company changed its product and marketing strategy for the use of DXI's technology and re-assessed DXI's profitability outlook. This triggered the requirement that the Company test the recorded goodwill for impairment in accordance with ASC 350-20-35. First, the Company estimated the fair value of its three reporting units at the time using the market approach. Under the market approach, the Company utilized the market capitalization of its publicly-traded shares and comparable company information to determine revenue multiples which were used to determine the fair value of the reporting unit. Based on this approach, the Company determined that there was an indication of impairment only for its DXI reporting unit, which was within the Company's Europe reporting segment, as the carrying value including goodwill exceeded the estimated fair value. As largely independent cash flows could not be attributed to any assets individually the Company evaluated DXI's assets and liabilities as one asset group. Then the Company estimated the fair value of DXI's asset group using discounted cash flow methods to determine the implied fair value of goodwill. The difference between this implied fair value of the goodwill and its carrying value was recorded as impairment. The outcome of the analysis resulted in a non-cash expense for impairment of property and equipment, intangible assets and goodwill of $0.3 million, $1.2 million, $8.0 million, respectively, which was recorded during the third quarter of fiscal year 2018 as a separate line item in the Company's Consolidated Statements of Operations.

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



	Total
Balance at March 31, 2017	46,136
Impairment loss	(8,036	)
Foreign currency translation	1,954
Balance at March 31, 2018	40,054
Balance at Additions due to acquisitions	500
Foreign currency translation	(860	)
Balance at March 31, 2019	39,694

Deferred Sales Commission Costs

Amortization expense for the deferred sales commission costs for the year ended March 31, 2019, was $14.2 million. Prior to the adoption of ASC 606, the Company did not defer sales commission costs. There were no impairment losses relative to the costs capitalized for the year ended March 31, 2019.