Patents and other intangible assets |
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Dec. 31, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Goodwill And Intangible Assets Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Patents and other intangible assets |
Patents and other intangible assets are recorded at cost, or when acquired as a part of a business combination at estimated fair value. These assets are amortized on a straight-line basis over the useful lives of the assets. The Company’s weighted average amortization period for developed technologies is 11 years.
Amortization expense for intangible assets was $1.8 million, $1.7 million and $2.3 million for the years ended December 31, 2016, 2015 and 2014, respectively. Future amortization expense for intangible assets is estimated as follows:
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