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Subsequent events | 9 Months Ended
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Sep. 30, 2019
Subsequent Events [Abstract] |
Subsequent events | Subsequent events Acquisition of BioElectron Technology Corporation On October 25, 2019, the Company completed the acquisition of substantially all of the assets of BioElectron Technology Corporation (“BioElectron”), a Delaware corporation, (the “Acquisition”) pursuant to an Asset Purchase Agreement by and between the Company and BioElectron, dated October 1, 2019 (the “Acquisition Agreement”). Upon the closing of the Acquisition, the Company paid to BioElectron total upfront consideration of $10.0 million, funded with cash on hand, less (i) transaction expenses incurred by BioElectron, (ii) the amount of outstanding indebtedness of BioElectron including a $4.0 million loan advance to BioElectron plus accrued and unpaid interest thereon and (iii) $1.5 million to be held in an escrow account to secure potential indemnification obligations owed to the Company. The loan advance was included in prepaid expenses and other current assets on the consolidated balance sheet as of September 30, 2019. Subject to the terms and conditions of the Acquisition Agreement, BioElectron may become entitled to receive contingent milestone payments of up to $200.0 million (in cash or in shares of the Company’s common stock, as determined by the Company) from the Company based on the achievement of certain regulatory and net sales milestones. Subject to the terms and conditions of the Acquisition Agreement, BioElectron may also become entitled to receive contingent payments of a low single digit percentage of net sales of certain products. Tegsedi Approval in Brazil Tegsedi received marketing authorization from ANVISA in October 2019 for the treatment of stage 1 or stage 2 polyneuropathy in adult patients with hATTR amyloidosis in Brazil. Refer to Note 12 for further details regarding our commitments and contingencies related to Tegsedi.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 + Details
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