Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total net revenues	$ 118,566	$ 129,071
Ampyra
Disaggregation Of Revenue [Line Items]
Total net revenues	72,945	84,555
Inbrija U.S.
Disaggregation Of Revenue [Line Items]
Total net revenues	27,989	29,634
Inbrija ex-U.S.
Disaggregation Of Revenue [Line Items]
Total net revenues	2,911
Net Product Revenues
Disaggregation Of Revenue [Line Items]
Total net revenues	103,845	114,189
Royalty Revenues
Disaggregation Of Revenue [Line Items]
Total net revenues	14,221	$ 14,882
License Revenue
Disaggregation Of Revenue [Line Items]
Total net revenues	$ 500