Trademarks and Other Intangibles

Trademarks and other intangibles, net consist of the following:



($ in thousands)	Weighted Average Amortization Period	September 30, 2019
($ in thousands)	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks (indefinite-lived)	n/a	$	69,100	$	—	$	69,100
Trademarks (finite-lived)	15 years	15,463		4,294		11,169
Trademarks (finite-lived)	18 years	37,994		1,536		36,458
Other intellectual property	7 years	762		400		362
Copyrights and other intellectual property	10 years	190		105		85
Customer list	5 years	200		27		173
Total		$	123,709	$	6,362	$	117,347



($ in thousands)	Weighted Average Amortization Period	December 31, 2018
($ in thousands)	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks (indefinite-lived)	n/a	$	96,707	$	—	$	96,707
Trademarks (finite-lived)	15 years	15,463		3,521		11,942
Other intellectual property	7 years	561		321		240
Copyrights and other intellectual property	10 years	190		90		100
Total		$	112,921	$	3,932	$	108,989

Amortization expense for intangible assets was approximately $0.83 million for the three-month period ended September 30, 2019 (the "current quarter") and was approximately $0.28 million for the three-month period ended September 30, 2018 (the "prior year quarter"). Amortization expense for intangible assets was approximately $2.43 million for the nine-month period ended September 30, 2019 (the "current nine months") and was approximately $0.85 million for the nine-month period ended September 30, 2018 (the "prior year nine months").

The trademarks related to the Isaac Mizrahi Brand and the Ripka Brand have been determined to have indefinite useful lives and, accordingly, no amortization has been recorded for these assets.

Effective January 1, 2019, and in consideration of the acquisition of the Halston and Halston Heritage trademarks in February 2019, the Company has determined that the Halston brand, inclusive of all of its trademarks, including H Halston, and H by Halston, has a finite life of 18 years, and is amortized on a straight-line basis accordingly. Prior to January 1, 2019, the H Halston and H by Halston assets were considered indefinite-lived assets.