Income taxes - Additional Information (Details)	12 Months Ended
Dec. 31, 2022 USD ($)
Research and development credit	$ 58,069
Discontinued Operations.
Operating Loss Carryforwards	17,900,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards	1,700,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 1,600,000

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

Name:	us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration