Long-Term Debt, Credit Facility with XYQ Luxco (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended
	May 31, 2021	Sep. 30, 2023	Mar. 31, 2023
Outstanding Debt Obligations [Abstract]
Total debt, net		$ 389,445	$ 375,515
Less: current portion		(48,998)	(40,720)
Dermavant [Member] | Credit Facility with XYQ Luxco [Member]
Loan and Credit Agreements by Dermavant [Abstract]
Proceeds from Lines of Credit	$ 40,000
Debt instrument, term	5 years
Interest rate	10.00%
Debt instrument exit fee and end of term charge	$ 5,000
Reduction in exit fee	$ 4,000
Warrants issued (in shares)	1,199,072
Exercise price of warrants (in dollars per share)	$ 0.01
Outstanding Debt Obligations [Abstract]
Principal amount		40,000	40,000
Exit fee		5,000	5,000
Less: unamortized discount and debt issuance costs		(8,905)	(10,170)
Total debt, net		36,095	34,830
Less: current portion		0	0
Total long-term debt, net		$ 36,095	$ 34,830