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INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS INTANGIBLE ASSETS
Intangible assets consisted of the following:
 
September 30,
2019
 
December 31,
2018
Intangible assets:
 
 
 
Finite-lived intangible assets
$
642,677

 
$
307,995

Indefinite-lived intangible assets
—

 
326,359

Gross intangible assets:
642,677

 
634,354

Less: Accumulated amortization
(179,828
)
 
(142,546
)
Net carrying value
$
462,849

 
$
491,808


During the second quarter of 2019, $326.4 million of indefinite-lived intangible assets were reclassified to definite-lived as the underlying in-process research and development (IPR&D) was placed into service upon receiving European regulatory approval for Palynziq. The Company will straight-line the amortization expense for the underlying IPR&D over its estimated useful life through August 2028.
During the second quarter of 2019, the Company recorded a $15.0 million gain on sale of intangible assets in the Condensed Consolidated Statements of Comprehensive Income (Loss) due to a third party's achievement of a commercial sales milestone related to a previously sold intangible asset.