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Period Type:

Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended				6 Months Ended
	Mar. 14, 2025	Mar. 13, 2025	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate inducement awards outstanding			4,392,430				4,392,430
Number of options, outstanding			6,624,927				6,624,927
Common stock, shares outstanding			134,365,950				134,365,950		98,776,265
Stock-based compensation expense recognized			$ 9,639		$ 5,253		$ 16,771	$ 8,679
Nominal amount of expense in relation to ESPP recognized				$ 276		$ 186
Accrued expenses			37,222				37,222		$ 20,446
Unrecognized stock-based compensation expense related to unvested options granted			$ 38,100				$ 38,100
Weighted average period for recognition of unvested options granted							3 years 2 months 12 days
Employee Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period for recognition of unvested options granted							2 years 10 months 24 days
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of other than options, outstanding			60,000				60,000
Number of shares, granted							2,954,895
Number of shares, vested							462,361
Stock-based compensation expense recognized			$ 7,000		3,600		$ 11,600	5,400
Unrecognized stock-based compensation expense related to unvested options granted			67,400				$ 67,400
Directors' Deferred Share Unit Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, vested							199,026
Stock-based compensation expense recognized			5,200		200		$ 6,200	200
Accrued expenses			$ 8,900				$ 8,900
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, outstanding			4,013,430				4,013,430
Number of shares, granted							1,251,480
Stock-based compensation expense recognized			$ 2,600		$ 1,600		$ 5,000	$ 3,200
Nominal amount of expense in relation to ESPP recognized							$ 200
Nominal amount of expense in relation to ESPP							33,787
Performance shares units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage							200.00%
Number of other than options, outstanding			319,000				319,000
Number of shares, granted							34,500
Vesting period							36 months
Requisite service period							36 months
Performance shares units \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted							319,500
Performance shares units \| Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted							639,000
MindMed Stock Option Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage		15.00%					15.00%
Number of shares, granted	0
Vesting rights, description							Prior to March 14, 2025, the Company was authorized to issue a number of equity awards equal to 15% of the Company’s issued and outstanding Common Shares under the terms of the 2020 Option Plan, together with Common Shares that were issuable pursuant to outstanding awards or grants under any other compensation or incentive mechanism involving the issuance or potential issuance of Common Shares, including the MindMed Performance and Restricted Share Unit Plan (“2020 PRSU Plan”) and ESPP.
MindMed Stock Option Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding					9,318,090			9,318,090
MindMed Stock Option Plan \| Restricted Share Unit Awards and Performance Share Unit Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding					5,817,111			5,817,111
MindMed Stock Option Plan \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding					3,500,979			3,500,979
2025 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for future issuance			5,000,000		4,500,000		5,000,000	4,500,000
2025 Equity Incentive Plan \| RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted							2,315,895
2025 Equity Incentive Plan \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted							536,495
2025 Equity Incentive Plan \| Performance shares units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted							285,000
2026 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for future issuance			3,000,000				3,000,000
Number of shares, granted							0
PRSU Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage							15.00%
Number of shares, granted	0