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Intangible assets and goodwill | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets and goodwill | Intangible assets and goodwill Definite-lived intangibles On April 20, 2017, the Company completed its previously announced acquisition of all rights to Emflaza pursuant to the Asset Purchase Agreement, dated March 15, 2017, and amended on April 20, 2017, by and between the Company and Marathon. The assets acquired by the Company in the Transaction include intellectual property rights related to Emflaza, inventories of Emflaza, and certain contractual rights related to Emflaza. In accordance with ASU 2017-01, the Company determined that substantially all of the fair value is concentrated in the Emflaza rights intangible asset and as such accounted for the transaction as an asset acquisition under ASC 805-50 and recorded an intangible asset of $148.4 million, which is being amortized to cost of product sales over its expected useful life of approximately seven years on a straight line basis. Marathon is entitled to receive contingent payments from the Company based on annual net sales of Emflaza beginning in 2018, up to a specified aggregate maximum amount over the expected commercial life of the asset. In accordance with the guidance for an asset acquisition, the Company will record the milestone payment when it becomes payable to Marathon and increase the cost basis for the Emflaza rights intangible asset. For the twelve month period ended December 31, 2019 and 2018, milestones payments of $27.1 million and $14.4 million were recorded, respectively. These payments are being amortized over the remaining useful life of the Emflaza rights asset on a straight line basis. As of December 31, 2019, a milestone payable to Marathon of $11.4 million was recorded on the balance sheet within accounts payable and accrued expenses. Pursuant to the Akcea Collaboration and License Agreement, in May 2019 the Company made a $6.0 million milestone payment to Akcea upon regulatory approval of Waylivra from the EMA. The payment was recorded as an intangible asset and is being amortized to cost of product sales over its expected useful life of approximately ten years on a straight line basis. Additionally, in December 2019, the Company made a $4.0 million milestone payment to Akcea upon regulatory approval of Tegsedi from ANVISA. The payment was recorded as an intangible asset and is being amortized to cost of product sales over its expected useful life of approximately ten years on a straight line basis. Akcea is also entitled to receive royalty payments subject to certain terms set forth in the Akcea Collaboration and License Agreement related to sales of Waylivra. In accordance with the guidance for an asset acquisition, the Company will record royalty payments when they become payable to Akcea and increase the cost basis for the Waylivra intangible asset. For the twelve month periods ended December 31, 2019, 2018, and 2017, the Company recognized amortization expense of $27.7 million, $22.9 million, and $15.4 million respectively, related to the Emflaza rights, Waylivra, and Tegsedi intangible assets, resulting in accumulated amortization of $65.9 million as of December 31, 2019. The estimated future amortization of the Emflaza rights, Waylivra, and Tegsedi intangible assets is expected to be as follows:
|  | As of December 31, 2019
2020 |  | $ | 31,139 |
2021 |  | 31,139 |
2022 |  | 31,139 |
2023 |  | 31,139 |
2024 and thereafter |  | 9,444 |
Total |  | $ | 134,000 |
The weighted average remaining amortization period of the definite-lived intangibles as of December 31, 2019 was 4.5 years. Indefinite-lived intangibles In connection with the acquisition of the Company’s gene therapy platform from Agilis (Note 3), the Company acquired rights to PTC-AADC, for the treatment of AADC deficiency. AADC deficiency is a rare CNS disorder arising from reductions in the enzyme AADC that result from mutations in the dopa decarboxylase gene. The gene therapy platform also includes an asset targeting Friedreich ataxia, a rare and life-shortening neurodegenerative disease caused by a single defect in the FXN gene which causes reduced production of the frataxin protein. Additionally, the gene therapy platform includes two other programs targeting CNS disorders, including Angelman syndrome, a rare, genetic, neurological disorder characterized by severe developmental delays. In accordance with the acquisition method of accounting, the Company allocated the acquisition cost for the Merger to the underlying assets acquired and liabilities assumed, based upon the estimated fair values of those assets and liabilities at the date of acquisition. The Company classified the fair value of the acquired IPR&D as indefinite lived intangible assets until the successful completion or abandonment of the associated research and development efforts. The value allocated to the indefinite lived intangible assets was $576.5 million. There have been no changes to the balance of the indefinite-lived intangibles since the Merger. The Company performed a qualitative annual impairment test for its indefinite-lived intangible assets as of October 1, 2019 and concluded that no impairment exists as of December 31, 2019. Goodwill As a result of the Merger on August 23, 2018, the Company recorded $82.3 million of goodwill, which included a measurement period adjustment of $18.0 million recorded during the three month period ended December 31, 2018. This adjustment was related to the finalization of the fair values assigned to the intangible assets and corresponding deferred tax liability, the contingent consideration, and the deferred consideration. Refer to Note 3 for further details. There have been no changes to the balance of goodwill since the date of the Merger. Accordingly, the goodwill balance as of December 31, 2018 and 2019 was $82.3 million. The Company performed an annual impairment test for goodwill as of October 1, 2019 and concluded that no impairment exists as of December 31, 2019. Collaboration and Licensing Agreement On August 1, 2018, the Company entered into a Collaboration and License Agreement with Akcea for the commercialization of Tegsedi and Waylivra, and products containing those compounds in countries in Latin America and the Caribbean. Pursuant to the agreement, the Company paid Akcea an upfront licensing fee, which included an initial payment of $12.0 million and a second payment of $6.0 million that was paid after Waylivra received regulatory approval from the the EMA in May 2019. The Company evaluated the agreement under the guidance in ASC 730 and concluded that the acquired rights to commercialize the products had no alternative future use as of the date of the Merger. Accordingly, the $12.0 million was charged to research and development expense in the consolidated statements of operations for the twelve month period ended December 31, 2018. As denoted above, the $6.0 million milestone payment to Akcea upon regulatory approval of Waylivra from the EMA was recorded as an intangible asset in 2019 as the product was now approved and thus capable of providing future benefit.

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