|9 Months Ended|
Sep. 30, 2018
|Goodwill and Intangible Assets Disclosure [Abstract]|
The following table summarizes the components of gross and net intangible asset balances (in thousands):
Finite-lived intangible assets are amortized over their weighted average lives, which are 14 years for technology, 10 years for customer related intangibles, 7 years for trade names, 6 years for internally developed software, 13 years for patents, 2 years for service agreements and 11 years weighted average in total.
Internally developed software consists of $14.0 million relating to costs incurred for development of internal use computer software and $2.2 million for development of software to be sold.
Amortization expense related to intangible assets with definite lives was as follows (in thousands):
The amortization expense amounts shown above include internally developed software not held for sale of $0.5 million and $1.5 million for the three and nine months ended September 30, 2018, respectively. The amortization expense for internally developed software not held for sale is recorded within the Company's income statement as a general and administrative operating expense.
Expected amortization expense related to amortizable intangible assets is as follows (in thousands):
The entire disclosure for all or part of the information related to intangible assets.
Reference 1: http://www.xbrl.org/2003/role/presentationRef