Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			6 Months Ended
	Mar. 14, 2025	Mar. 13, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate inducement awards outstanding			2,142,900			2,142,900
Number of options, outstanding			5,148,374			5,148,374
Common stock, shares outstanding			75,803,251			75,803,251		75,100,763
Weighted average exercise price, issued						$ 6.95
Stock-based compensation expense recognized			$ 5,253		$ 5,430	$ 8,679	$ 9,119
Nominal amount of expense in relation to ESPP recognized				$ 186
Accrued expenses			14,797			14,797		$ 12,829
Unrecognized stock-based compensation expense related to unvested options granted			$ 17,200			$ 17,200
Weighted average period for recognition of unvested options granted						2 years 10 months 24 days
Estimated ESPP awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nominal amount of expense in relation to ESPP recognized						$ 100
Nominal amount of expense in relation to ESPP						34,017
Weighted average period for recognition of unvested options granted						2 years 9 months 18 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						5,274,500
Stock-based compensation expense recognized			$ 3,600		2,700	$ 5,400	4,800
Unrecognized stock-based compensation expense related to unvested options granted			34,100			$ 34,100
Directors' Deferred Share Unit Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, vested						190,917
Stock-based compensation expense recognized			200		200	$ 200	600
Accrued expenses			$ 1,300			$ 1,300
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, outstanding			1,832,900			1,832,900
Number of shares, granted						1,242,550
Stock-based compensation expense recognized			$ 1,600		$ 2,700	$ 3,200	$ 4,300
Performance shares units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage						200.00%
Number of other than options, outstanding			250,000			250,000
Number of shares, granted						250,000
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						1,973,000
Performance shares units | Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted						3,946,000
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 such number of equity awards equal to 15% of the Company’s issued and outstanding Common Shares under the terms of the MindMed Stock Option Plan (the “Stock 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 (the “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 | 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 issuance			4,500,000			4,500,000
2025 Equity Incentive Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted						0
2025 Equity Incentive Plan | Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, granted						375,935
PRSU Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage						15.00%
Number of shares, granted	0