The changes in the carrying amount of goodwill related to our various reporting units for the years ended December 31, 2019 and 2018 were as follows (in thousands):

						Discontinued Operations
	OneClick USA			Simply Mac		Verykool Products			OneClick Argentina			OneClick Dominican Republic			Total
Balance at December 31, 2017	$	1,425		$	—	$	—		$	4,511		$	—		$	5,936
2018 acquisitions		—			—		3,343			—			4,399			7,742
Impairment charge		(1,425	)		—		(3,343	)		(4,511	)		(4,399	)		(13,678	)
Balance at December 31, 2018		—			—		—			—			—			—
2019 acquisitions		—			699		—			—			—			699
Balance at December 31, 2019	$	—		$	699	$	—		$	—		$	—		$	699

The Company performs an impairment test of goodwill on an annual basis during the fourth quarter, or when circumstances indicate that the carrying value of goodwill might be impaired. As a result of our annual impairment test in the fourth quarter of fiscal 2018, the Company recognized goodwill impairment charges totaling $13,678,000, of which $12,253,000 was related to reporting units classified as a discontinued operations.

The changes in the carrying amounts of definite-lived intangible assets related to our various reporting units for the years ended December 31, 2019 and 2018 were as follows (in thousands):

				Discontinued Operations
	Simply Mac			OneClick International			OneClick Dominican Republic			Total
Balance at December 31, 2017	$	—		$	1,135		$	—		$	1,135
2018 acquisition		—			—			76			76
Amortization		—			(252	)		(14	)		(266	)
Impairment charge		—			—			(62	)		(62	)
Balance at December 31, 2018		—			883			—			883
2019 acquisition		2,092			—			—			2,092
Amortization		(37	)		(253	)		—			(290	)
Impairment charge		—			(630	)		—			(630	)
Balance at December 31, 2019	$	2,055		$	—		$	—		$	2,055

During 2018, the Company evaluated the intangibles in connection with its annual goodwill impairment analysis and recognized an impairment charge of $62,000 related to the write-off of the tradename and covenant not-to-compete from the Unitron acquisition. During 2019, the Company recognized an impairment charge of $630,000 related to the write-off of the OneClick tradename and covenant not-to-compete.

The Company’s definite-lived intangible asset at December 31, 2019 is comprised of the Simply Mac trade name arising from the September 25, 2019 acquisition of Simply Mac. The Simply Mac trade name is being amortized over 15 years. Amortization expense for the year ended December 31, 2019 was $37,000. The carrying value of intangible assets at December 31, 2019 consisted of the following (in thousands):