Commitments and Contingencies - Additional Information (Detail) - USD ($)			9 Months Ended
	Mar. 12, 2021	Jan. 15, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Loss Contingency, Lawsuit Filing Date		January 15, 2021
Loss Contingency, Name of Plaintiff		Genfit S.A.
Loss Contingency, Allegations		alleging misappropriation of trade secrets and related causes of action based on the Company’s receipt of a Genfit protocol synopsis for Genfit’s Phase 3 clinical trial of its drug candidate elafibranor in patients with primary biliary cholangitis.
Loss Contingency, Actions Taken by Defendant		The Company intends to defend itself vigorously. While the outcome of any litigation is inherently uncertain, based on currently available information, management does not currently believe a loss associated with this matter is probable, nor is any amount reasonably estimable
Indemnification liabilities				$ 0	$ 0
Loss Contingency, Actions Taken by Court, Arbitrator or Mediator	On March 12, 2021, the Court granted a Temporary Restraining Order (later converted to a Preliminary Injunction), prohibiting the Company from accessing or disseminating the protocol synopsis, using any Genfit trade secrets contained therein or destroying any evidence related thereto.
Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Lawsuit Filing Date			April 16, 2021