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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2020
Subsequent Events
Subsequent Events	10. Subsequent Events The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates and to identify matters that require additional disclosure. Subsequent events have been evaluated as required. On October 26, 2020, the Company announced that the Phase 3 PolarisDMD trial of the Company’s lead product candidate, edasalonexent, for the treatment of DMD did not meet the primary and secondary endpoints of the trial. Based on these results, the Company announced that it was stopping activities related to the development of edasalonexent, including the Company’s ongoing open-label extension trial, and that it plans to work with external advisors to explore and evaluate strategic options. The Company anticipates that it will incur less than $0.5 million of additional expenses related to the early termination of contracts.