Business concentrations - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Vendor	Dec. 31, 2021 Vendor
Vendor Concentration Risk [Member] | Accounts Payable [Member]
Concentration Risk [Line Items]
Number of vendors | Vendor	3	1
Three Vendor [Member] | Vendor Concentration Risk [Member] | Accounts Payable [Member] | Maximum [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
One Vendor [Member] | Vendor Concentration Risk [Member] | Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		54.50%
Mayne Pharma [Member]
Concentration Risk [Line Items]
Customer license revenue percentage	98.00%
Royalty receivable short term portion	$ 1.5
Royalty receivable long term portion	20.3
Mayne Pharma [Member] | Accrued Expenses and Other Current Liabilities [Member]
Concentration Risk [Line Items]
Prepaid royalties received	$ 1.0
Theramex [Member]
Concentration Risk [Line Items]
Customer license revenue percentage		100.00%