Intangible assets consist of trademark and customer lists acquired in the offer under the purchase method of accounting and are recorded at fair value net of accumulated amortization since the purchase date. Software license is recorded at cost. Amortization is calculated using the straight-line and accelerated methods over the following estimated useful lives:

 

 

The carrying amount related to acquired intangible assets as of September 30, 2018 are as follows ($ in thousands):

 

 

The future amortization of these intangible assets is as follows ($ in thousands):

 

 

The Company reviews its finite-lived intangible assets for impairment when events or changes in circumstances indicate that the carrying amount of a finite-lived intangible asset may not be recoverable. Recoverability of a finite-lived intangible asset is measured by a comparison of its carrying amount to the undiscounted future cash flows expected to be generated by the asset. If the asset is considered to be impaired, the impairment recognized is measured by the amount by which the carrying amount of the asset exceeds the fair value of the asset. There were no indicators of impairment during the nine months ended September 30, 2018.