Goodwill and other intangible assets (Details) - USD ($)	3 Months Ended			6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2022	Dec. 31, 2017	Sep. 30, 2021
Goodwill and other intangible assets
Balance of finite-lived intangible assets	$ 14,350,000	$ 3,500,000		$ 14,350,000
Estimated useful life				80 months
In-process R&D.
Goodwill and other intangible assets
Balance of finite-lived intangible assets	3,500,000	3,500,000		$ 3,500,000		$ 5,900,000
Intangible assets fair value		3,500,000
Impairment expense	$ 0	$ 2,400,000	$ 0
Pelican Therapeutics, Inc. | In-process R&D.
Goodwill and other intangible assets
Finite-lived intangible assets acquired					$ 5,900,000