The minimum stat-requirements for dual-classing a Thief to a Mage are 15 DEX and 17 INT. Of course, two 18's are better.
If you aim for a Thief -> Mage, consider making him/her a Swashbuckler -> Mage. If you dual, you can choose a kit for your starting class, and the bonuses a Swashbuckler gets are really helpful to a Mage-type character. For instance, as a Mage you can't cast spells while wearing armor, so the AC-bonuses are particularly nice.
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