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Full Idea
Hegel's 'dialectic' is often characterised in terms of the triad of thesis, antithesis and synthesis. This is, however, not the way he presents it. The core of the dialectic is rather what Hegel terms the 'negation of the negation'.
Gist of Idea
Rather than in three stages, Hegel presented his dialectic as 'negation of the negation'
Source
report of Georg W.F.Hegel (works [1812]) by Andrew Bowie - Introduction to German Philosophy
Book Ref
Bowie,Andrew: 'Introduction to German Philosophy' [Polity 2003], p.84
A Reaction
Interestingly, this connects it to debates about intuitionist logic, which denies that double-negation necessarily makes a positive. Presumably Marx emphasised the first reading.