Leases - Additional Information (Detail)			1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended		17 Months Ended
	Nov. 19, 2021 USD ($) ft² Option	Oct. 23, 2020 USD ($) ft²	Apr. 30, 2019 USD ($) ft² Option	Dec. 31, 2020 USD ($) ft²	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) ft²	Jun. 30, 2021 USD ($)	May 31, 2020 USD ($) ft²	Mar. 31, 2020 USD ($) ft²	Jan. 31, 2016 ft² Option
Lessee Lease Description [Line Items]
Estimated lease payments					$ 153,427,000		$ 153,427,000
Operating lease cost					3,400,000	$ 1,600,000	6,000,000	$ 3,600,000
Variable lease cost					200,000	100,000	500,000	600,000
Short-term lease cost					$ 0	$ 0	0	0
Operating lease cash payments							$ 3,400,000	$ 2,200,000
Weighted-average remaining lease term					7 years 3 months 18 days		7 years 3 months 18 days
Weighted-average discount rate					8.50%		8.50%
Halozyme, Inc. | California | Sublease Agreement
Lessee Lease Description [Line Items]
Office space leases (in sq ft) | ft²										21,000
Estimated lease payments										$ 2,000,000
Corporate Headquarters In Pasadena | California
Lessee Lease Description [Line Items]
Office space leases (in sq ft) | ft²		24,000
Estimated lease payments		$ 6,900,000
Payments for leasehold improvements, net of tenant improvement allowances		$ 4,000,000
Corporate Headquarters In Pasadena | Colorado Owner, LLC | California
Lessee Lease Description [Line Items]
Lease term			91 months
Office space leases (in sq ft) | ft²			24,000
Estimated lease payments			$ 8,700,000
Payments for leasehold improvements, net of tenant improvement allowances			$ 3,500,000
Number of options to renew | Option			1
Operating lease renewal term			5 years
Research Facility in Madison | Wisconsin
Lessee Lease Description [Line Items]
Office space leases (in sq ft) | ft²											60,000
Estimated lease payments				$ 1,200,000					$ 26,200,000
Number of options to renew | Option											2
Operating lease renewal term											5 years
Additional office space for lease | ft²				10,743					40,000
Expected leasehold improvements, net of tenant improvement allowances									$ 11,000,000
Research Facility in San Diego | California
Lessee Lease Description [Line Items]
Lease term	15 years
Office space leases (in sq ft) | ft²	144,000				144,000		144,000
Estimated lease payments	$ 119,000,000
Payments for leasehold improvements, net of tenant improvement allowances	$ 31,000,000
Operating lease renewal term	10 years
Estimated payments for operating expenses	$ 3,000,000
Research Facility in San Diego | California | Maximum
Lessee Lease Description [Line Items]
Number of options to renew | Option	1