Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 10, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Commitment And Contingencies [Line Items]
Commitments and contingencies
Purchase Obligation		100,594,000
Cash		5,300,000
Cost of sales		40,787,000	33,513,000
Catalent Member
Commitment And Contingencies [Line Items]
Purchase Commitment, Description	The manufacturing services agreement provides that Catalent will manufacture Inbrija, to the Company’s specifications, and the Company will purchase Inbrija exclusively from Catalent during the term of the manufacturing services agreement; provided that such exclusivity requirement will not apply to Inbrija intended for sale in China. Under the Company’s agreement with Catalent, it is obligated to make minimum purchase commitments for Inbrija through the expiration of the agreement on December 31, 2030
Cost of sales		6,200,000
Purchase Commitment, Remaining Minimum Amount Committed		0		$ 9,000,000
Purchase Commitment Remaining Minimum Amount Committed There After		$ 18,000,000.0
Catalent Member | Inbrija
Commitment And Contingencies [Line Items]
Purchase Commitment, Description		An amendment to the agreement has been signed by the parties for the period July 1, 2021 through June 30, 2022, which eliminates the minimum purchase obligation by Acorda and states that payment shall only be required upon successful production and delivery of Inbrija by Catalent
Purchase Obligation		$ 16,000,000
Purchase Obligation from 2022 through 2030		18,000,000
Licensing Agreements
Commitment And Contingencies [Line Items]
Unpaid license royalties		6,000,000
Commitment legal cost		2,000,000
Commitments and contingencies			$ 2,000,000
Maximum
Commitment And Contingencies [Line Items]
Maximum milestone payments		18,500,000
Minimum | Catalent Member | Inbrija
Commitment And Contingencies [Line Items]
Original Purchase Obligation		$ 17,000,000