(8)Other Intangible Assets

Other intangible assets consist of the following:


	December 31, 2019
	Weighted Average Useful Life (years)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
Finite-lived intangible assets:
Developed technology	10.0	$	14,362	$	(1,496)	$	12,866
Trademarks/Tradenames	10.0		2,045		(381)		1,664
Covenant not to compete	3.0		76		(65)		11
	10.0		16,483		(1,942)		14,541
Indefinite-lived intangible assets:
In-process research and development	indefinite		14,133		—		14,133
Total		$	30,616	$	(1,942)	$	28,674


	December 31, 2018
	Weighted Average Useful Life (years)	Gross Carrying Amount		Accumulated Amortization		Net Book Value
Finite-lived intangible assets:
Developed technology	10.0	$	14,362	$	(60)	$	14,302
Trademarks/Tradenames	10.0		2,045		(177)		1,868
Covenant not to compete	3.0		76		(40)		36
	10.0		16,483		(277)		16,206
Indefinite-lived intangible assets:
In-process research and development	indefinite		20,721		—		20,721
Total		$	37,204	$	(277)	$	36,927

The gross amount and accumulated impairment loss of indefinite-lived intangible assets are as follows (in thousands):


	December 31,
	2019		2018
Gross amount	$	20,721	$	20,721
Accumulated impairment loss		(6,588)		—
Indefinite-lived intangible assets, net	$	14,133	$	20,721

Amortization expense for the years ended December 31, 2019 and 2018 were approximately $1.7 million and $0.2 million, respectively.

Estimated amortization expense for each of the years ending December 31 is as follows: