Asset Impairments	12 Months Ended
Dec. 31, 2016
Asset Impairments	3. Asset Impairments During 2016, the company recorded $1.2 million ($1.2 million after tax) to cost of goods sold for the impairment of a prepaid asset. During 2015 and 2014, the company recorded $4.5 million ($2.8 million after tax) and $6.8 million ($4.3 million after tax), respectively, to research and development expense for the impairment of IPR&D projects, primarily due to changes in cash flow assumptions. Asset impairment charges were measured at fair value using significant unobservable inputs that are categorized as Level 3 under the fair value hierarchy, which is described further in Note 6 of the notes to consolidated financial statements.

Asset Impairments

12 Months Ended

Dec. 31, 2016

3. Asset Impairments

During 2016, the company recorded $1.2 million ($1.2 million after tax) to cost of goods sold for the impairment of a prepaid asset. During 2015 and 2014, the company recorded $4.5 million ($2.8 million after tax) and $6.8 million ($4.3 million after tax), respectively, to research and development expense for the impairment of IPR&D projects, primarily due to changes in cash flow assumptions.

Asset impairment charges were measured at fair value using significant unobservable inputs that are categorized as Level 3 under the fair value hierarchy, which is described further in Note 6 of the notes to consolidated financial statements.