Intangible Assets	6 Months Ended
Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	6. Intangible Assets In the second quarter of 2019, we entered into an agreement and paid $192.5 million to buy out certain licensing arrangements from an unrelated third party. This new agreement and the related payment replace the variable royalty payments that otherwise would have been due under the terms of previous licensing arrangements through 2029. Under the new agreement, we maintain the rights to the counterparty’s intellectual property provided under the previous licensing arrangements. The $192.5 million payment was recognized as an intangible asset and will be amortized through 2029, which represents the useful life of the intellectual property. In the second quarter of 2019, we recognized $70.1 million of in-process research and development (“IPR&D”) intangible asset impairment due to the termination of certain IPR&D projects. The termination of these projects is the result of the progress we are making to prioritize our internal research and development portfolio and focus our engineering resources on the opportunities that most closely link to our mission. Since these projects were not a priority, their terminations are not expected to have a significant impact to our future cash flows.

Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

6. Intangible Assets

In the second quarter of 2019, we entered into an agreement and paid $192.5 million to buy out certain licensing arrangements from an unrelated third party. This new agreement and the related payment replace the variable royalty payments that otherwise would have been due under the terms of previous licensing arrangements through 2029. Under the new agreement, we maintain the rights to the counterparty’s intellectual property provided under the previous licensing arrangements. The $192.5 million payment was recognized as an intangible asset and will be amortized through 2029, which represents the useful life of the intellectual property.

In the second quarter of 2019, we recognized $70.1 million of in-process research and development (“IPR&D”) intangible asset impairment due to the termination of certain IPR&D projects. The termination of these projects is the result of the progress we are making to prioritize our internal research and development portfolio and focus our engineering resources on the opportunities that most closely link to our mission. Since these projects were not a priority, their terminations are not expected to have a significant impact to our future cash flows.