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Identifiable Intangible Assets	12 Months Ended
Identifiable Intangible Assets	Dec. 31, 2015
Identifiable Intangible Assets
Identifiable Intangible Assets	4. Identifiable Intangible Assets The Company's only identifiable intangible asset was in-process research and development ("IPRD") related to ARIKAYCE as of December 31, 2015 and 2014. The total intangible IPRD asset was $58.2 million as of December 31, 2015 and 2014, which resulted from the initial amount recorded at the time of the Company's merger with Transave in 2010 and subsequent adjustments in the value. Historically, the Company uses the income approach to derive the fair value of in-process research and development assets. This approach calculates fair value by estimating future cash flows attributable to the assets and then discounting these cash flows to a present value using a risk-adjusted discount rate. Identifiable intangible assets are measured at their respective fair values and are not amortized until commercialization. Once commercialization occurs, intangible assets will be amortized over their estimated useful lives. The Company did not identify any indicators of impairment of its in-process research and development intangible assets as of December 31, 2015.