0002019804 imsr:RedeemableWarrantsEachWholeWarrantExercisableForOneCommonStockAtPriceOf11.50PerShareMember 2026-10-21 2026-10-21 0002019804 imsr:CommonStockParValue0.0001PerShareMember 2026-10-21 2026-10-21 0002019804 2026-10-21 2026-10-21 0002019804 false 8-K 2026-10-21 TERRESTRIAL ENERGY INC. DE 001-42252 98-1785406 2730 W. Tyvola Road Suite 100 Charlotte NC 28217 646 687-8212 false false false false Common Stock, par value $0.0001 per share IMSR NASDAQ Redeemable Warrants, each whole warrant exercisable for one CommonStock at a price of $11.50 per share IMSRW NASDAQ true false