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Revenue recognition
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue recognition

11.        Revenue recognition

Net product sales

The Company views its operations and manages its business in one operating segment.

During the three months ended March 31, 2021 and 2020, net product sales in the United States were $43.5 million and $27.5 million, respectively, consisting solely of Emflaza, and net product sales not in the United States were $47.8 million and $40.7 million, respectively, consisting of Translarna, Tegsedi, and Waylivra. For the three months ended March 31, 2021 and 2020, the Company had a total of two and three distributors, respectively, that each accounted for over 10% of the Company’s net product sales.

The Company’s contract liabilities balances as of March 31, 2021 and as of December 31, 2020 were $1.9 million and $4.2 million, respectively. The Company did not have any contract assets as of March 31, 2021 and as of December 31, 2020. During the three month periods ended March 31, 2021 and 2020, the Company recognized $2.1 million and $2.0 million of revenue, respectively, related to the amounts included in the contract liability balance at the beginning of the period. The Company has not made significant changes to the judgments made in applying ASC Topic 606 for the three month periods ending March 31, 2021 and 2020.

Remaining performance obligations

Remaining performance obligations represent the transaction price for goods the Company has yet to provide. As of March 31, 2021 and December 31, 2020, the aggregate amount of the transaction price allocated to the remaining performance obligations relating to Translarna net product revenue was $1.9 million and $4.2 million, respectively. The Company expects to recognize revenue within the next one year, as the specific timing for satisfying the performance obligations is contingent upon a number of factors, including customers’ needs and schedules.

Collaboration and Royalty revenue

In November 2011, the Company and the SMA Foundation entered into the SMA License Agreement with Roche. Under the terms of the SMA License Agreement, Roche acquired an exclusive worldwide license to the Company’s SMA program.

The Company is eligible to receive additional payments from Roche if specified events are achieved with respect to each licensed product, including up to $135.0 million in research and development event milestones, up to $325.0 million in sales milestones upon achievement of specified sales events, and up to double digit royalties on worldwide annual net sales of a commercial product.

The SMA program currently has one approved product, Evrysdi™ (risdiplam), which was approved in August 2020 by the FDA for the treatment of SMA in adults and children two months and older.  As of March 31, 2021, the remaining potential research and development event milestones that can be received is $10.0 million, and the remaining potential sales milestones that can be received is $325.0 million.

For the three months ended March 31, 2021 and 2020, the Company recognized $20.0 million and $0.1 million of collaboration revenue, respectively, related to the licensing and collaboration agreement with Roche. The first commercial sale of Evrysdi in the European Union was made in March 2021. This event triggered a $20.0 million milestone payment

to the Company from Roche, which was recognized in the three months ended March 31, 2021. No milestones were triggered in the three months ended March 31, 2020.

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In addition to research and development and sales milestones, the Company is eligible to receive up to double-digit royalties on worldwide annual net sales of a commercial product under the SMA License Agreement. For the three months ended March 31, 2021, the Company has recognized $6.7 million of royalty revenue related to Evrysdi. No royalty revenue related to Evrysdi was recognized in the three months ended March 31, 2020.