For goodwill, the Company performs impairment reviews by reporting unit. For fiscal 2019, the Company determined it had three reporting units: Applied Technology, Engineered Films, and Aerostar. In fiscal 2020, the Company determined it had added a fourth reporting unit related to the acquisition of Smart Agand the acquisition of a majority ownership in DOT: Autonomy.


	Applied Technology (excluding Autonomy)		Autonomy		Engineered Films		Aerostar		Total
Balance at January 31, 2018	$	12,741	$	—	$	33,232	$	737	$	46,710
Additions due to business combinations	4,559		—		—		—		4,559
Divestiture of business	—		—		—		(103)		(103)
Foreign currency translation adjustment	(224)		—		—		—		(224)
Balance at January 31, 2019	17,076		—		33,232		634		50,942
Additions due to business combinations	(33)		56,022		—		—		55,989

Foreign currency translation adjustment	(100)		(322)		—		—		(422)
Balance at January 31, 2020	$	16,943	$	55,700	$	33,232	$	634	$	106,509

Goodwill is tested for impairment on an annual basis and between annual tests whenever a triggering event indicates there may be an impairment. The annual impairment tests were completed for each reporting unit in the fourth quarter based on a November 30th valuation date.

In fiscal 2020 and 2019 no triggering events were deemed to have occurred in any of the quarterly periods and no impairments were recorded as a result of the annual impairment testing. In its annual impairment testing, the Company concluded a quantitative analysis was not required for any of its reporting units based on the Company's qualitative analysis.

In fiscal 2018 no triggering events were deemed to have occurred in any of the quarterly periods and no impairments were recorded as a result of the annual impairment testing. In its annual impairment testing, the Company concluded a quantitative analysis was not required for the Applied Technology and Engineered Films reporting units. This was based on the Company's qualitative analysis and the fact that the estimated fair value in the Company's most recent impairment test substantially exceeded its carrying value for each of these reporting units.

For the Aerostar reporting unit, the Company determined the excess of the fair value of the reporting unit over its carry value in the previous year's annual impairment assessment was not significant enough based on the current macroeconomic conditions to perform a qualitative analysis. As such, the Company performed a quantitative analysis for the annual impairment assessment of the Aerostar reporting unit. In determining the estimated fair value of the Aerostar reporting unit, the Company was required to estimate a number of factors, including future revenues and expenses, projected capital expenditures, changes in net working capital and the discount rate. On the basis of these estimates, the November 30, 2017, analysis indicated that the estimated fair

value of the Aerostar reporting unit exceeded the reporting unit carrying value by approximately $11,600 or approximately 41%, as such there were no goodwill impairment losses reported in the year ended January 31, 2018.

The following table provides the gross carrying amount for intangible assets and the related accumulated amortization of definite-lived intangible assets:


	For the years ended January 31,
	2020										2019
			Accumulated						Accumulated
	Amount		amortization		Net		Amount		amortization		Net
Existing technology	$	9,190	$	(7,706)	$	1,484	$	9,203	$	(7,216)	$	1,987
Customer relationships	16,067		(6,868)		9,199		15,791		(5,508)		10,283
Patents and other intangibles	6,678		(2,444)		4,234		5,908		(1,885)		4,023
In-process research and development^(a)	31,300		—		31,300		—		—		—
Total	$	63,235	$	(17,018)	$	46,217	$	30,902	$	(14,609)	$	16,293
(a) Refer to Note 6 "Acquisitions and Investments in Businesses and Technologies" for a more detailed description of these indefinite-lived intangible assets acquired in business combinations in fiscal 2020.

The estimated future amortization expense table above does not reflect the expected amortization associated with indefinite-lived in-process R&D assets acquired in business combinations during fiscal 2020. Amortization of these indefinite-lived intangible assets will start upon completion of the current R&D projects, which is expected to occur in fiscal year 2021, on a straight-line basis over their remaining estimated useful life. The applicable table will be updated at such time these intangible assets are placed into service.

The Company assesses the recoverability of long-lived assets, including definite-lived intangibles, equity method investments, and property plant and equipment if events or changes in circumstances indicate that an asset might be impaired. For long-lived and intangible assets, the Company performs impairment reviews by asset groups. Management periodically assesses for triggering events and discusses any significant changes in the utilization of long-lived assets. For purposes of recognition and measurement of an impairment loss, a long-lived asset is grouped with other assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities.

When performing long-lived asset testing, the fair values of assets are determined based on valuation techniques using the best available information. Such valuations are derived from valuation techniques in which one or more significant inputs are not observable (Level 3 fair value measures). An impairment loss is measured and recognized when the carrying amount of an asset exceeds the estimated discounted cash flows.

The Company did not identify any triggering events for any of its asset groups during fiscal 2020 and 2019 and as such there were no impairment losses reported in the year ended January 31, 2020 or 2019, for any of the Company's long-lived assets.