Revenue Components - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	$ 25,172	$ 0	$ 54,681	$ 0
Total revenues	77,902	0	118,965	33,333
ORGOVYX
Disaggregation of Revenue [Line Items]
Revenues	18,663	0	29,142	0
MYFEMBREE
Disaggregation of Revenue [Line Items]
Revenues	629	0	1,704	0
Richter product supply and royalties
Disaggregation of Revenue [Line Items]
Revenues	1,771	0	1,771	0
Product revenue, net
Disaggregation of Revenue [Line Items]
Revenues	21,063	0	32,617	0
Amortization of Upfront Payment
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	20,974	0	41,948	0
Amortization of Regulatory Milestone
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	4,198	0	12,733	0
Richter license and milestone revenue
Disaggregation of Revenue [Line Items]
Revenues	$ 31,667	$ 0	$ 31,667	$ 33,333