Under IFRS 15, Merus reduced the period that it amortizes revenue for the upfront license payment received from Incyte from 21 years to 9 years, which resulted in €2.3 million of additional revenue for the three months ended September 30, 2017. Revenue is comprised primarily of the amortization of upfront license payments from Merus' collaboration agreements, and cost reimbursements and research milestones for performance of research and development services under the respective agreements. The increase in revenue for the period is attributable to €0.5 million of amortization of upfront license payments and milestone payments and €0.3 million of collaboration income for expense reimbursements.