4. Intangible Assets

The following is a summary of the components of intangible assets and the related accumulated amortization.:

Liquor license is considered to have an indefinite life and is reviewed for impairment annually and whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. No impairments were recognized for the nine months ended September 30, 2021 and 2020.

Amortization expense for the Successor period for the three and nine months ended September 30, 2021 was $1,807,000 and $5,431,000, respectively. Included within amortization expense is $3,000 and $18,000 for the three and nine months ended September 30, 2021 related to the amortization of lease acquisition costs. The intangible assets for the Predecessor period from January 1, 2020 to September 30, 2020 were determined to be indefinite life intangibles. As such, no amortization expense was recognized for the three and nine months ended September 30, 2020. The estimated aggregate amortization expense for intangible assets over the next five years ending December 31 and thereafter is as follows: