Long-Term Debt, Funding Agreement with NovaQuest (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	71 Months Ended
	Oct. 31, 2018	May 31, 2022	Jun. 30, 2023	Apr. 30, 2028	Mar. 31, 2023	Aug. 31, 2018
Carrying Balance of Debt Issued [Abstract]
Less: current portion			$ (27,490)		$ (26,940)
Total long-term debt, net			$ 187,140		180,700
Dermavant [Member] | Funding Agreement with NovaQuest [Member]
Funding Agreement with NovaQuest [Abstract]
Face amount	$ 17,500					$ 100,000
Proceeds from Issuance of Debt	117,500
Frequency of periodic payment			quarterly
Periodic payment			$ 36,700
Maximum milestone payment obligation	$ 440,600
Quarterly payments made		$ 7,300
Carrying Balance of Debt Issued [Abstract]
Fair value of long-term debt			214,630		207,640
Less: current portion			(27,490)		(26,940)
Total long-term debt, net			$ 187,140		$ 180,700
Dermavant [Member] | Funding Agreement with NovaQuest [Member] | Forecast [Member]
Funding Agreement with NovaQuest [Abstract]
Frequency of periodic payment				quarterly
Periodic payment				$ 176,300
Debt instrument, term				6 years
Dermavant [Member] | Funding Agreement with NovaQuest [Member] | Maximum [Member]
Funding Agreement with NovaQuest [Abstract]
Debt instrument, term	15 years
Maximum milestone payment obligation						141,000
Right to offset of commercial milestones payment						$ 88,100