Goodwill and other intangible assets (Details) - USD ($)	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2017
Goodwill and other intangible assets
Balance of finite-lived intangible assets	$ 9,033,125	$ 3,500,000		$ 9,033,125
In-process research and development impairment	3,500,000			$ 3,500,000
Estimated useful life				80 months
Fair value of contract deferred consideration liability	4,900,000			$ 4,900,000
Fair value of the intangible assets recognized	9,700,000			9,700,000
Increase (decrease) in fair value of contract deferred consideration	(1,600,000)
Increase (decrease) in goodwill and intangibles assets	$ (1,500,000)
In-process R&D.
Goodwill and other intangible assets
Balance of finite-lived intangible assets		3,500,000	$ 5,900,000
Intangible assets fair value		3,500,000
In-process research and development impairment		$ 2,400,000	$ 0	$ 3,500,000
Pelican Therapeutics, Inc. | In-process R&D.
Goodwill and other intangible assets
Finite-lived intangible assets acquired					$ 5,900,000