Revenue Components - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	$ 25,172	$ 1,379	$ 79,853	$ 1,379
Total revenues	54,440	1,379	173,405	34,712
ORGOVYX
Disaggregation of Revenue [Line Items]
Revenues	24,393	0	53,535	0
MYFEMBREE
Disaggregation of Revenue [Line Items]
Revenues	2,429	0	4,133	0
Richter product supply and royalties
Disaggregation of Revenue [Line Items]
Revenues	2,446	0	4,217	0
Product revenue, net
Disaggregation of Revenue [Line Items]
Revenues	29,268	0	61,885	0
Amortization of Upfront Payment
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	20,974	1,379	62,922	1,379
Amortization of Regulatory Milestone
Disaggregation of Revenue [Line Items]
Pfizer collaboration revenue	4,198	0	16,931	0
Richter license and milestone revenue
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 31,667	$ 33,333