In connection with the November 2018 acquisition of all the intellectual property and related assets of the OptoSeis^® fiber optic sensing technology business from PGS Americas, Inc., the Company recorded goodwill of $0.7 million and other intangible assets of $3.7 million.

In connection with the acquisition of Quantum in July 2018, the Company recorded goodwill of $4.3 million and other intangible assets of $8.2 million.

Goodwill represents the excess cost of the businesses acquired over the fair market value of identifiable net assets at the dates of acquisition.

At September 30, 2019, the Company evaluated its goodwill and other intangible assets for impairment and determined there was no impairment. The determination of the fair value requires estimates and projections of future revenue. These estimates and projections can be unpredictable, particularly for Quantum as an emerging business. Also see Note 1 to these consolidated financial statements.

As a result of these acquisitions, the Company’s consolidated goodwill and other intangible assets consisted of the following (in thousands):

	Weighted-Average Remaining Useful Lives (in years)		AS OF SEPTEMBER 30,
			2019			2018
Goodwill			$	5,008		$	4,343
Other intangible assets:
Developed technology	16.9			5,918			4,200
Customer relationships	2.9			3,900			2,500
Trade names	3.9			1,930			1,400
Non-compete agreements	3.0			170			100
Total other intangible assets		10.0		11,918			8,200
Accumulated amortization				(1,855	)		(194	)
			$	10,063		$	8,006

Other intangible assets amortization expense was $1.7 million and $0.2 million in fiscal years 2019 and 2018, respectively.

As of September 30, 2019, future estimated amortization expense of other intangible assets is as follows (in thousands):

For fiscal years ending September 30,
2020	$	1,732
2021		1,732
2022		1,624
2023		714
2024		342
Thereafter		3,919
	$	10,063