What is an ideological party?

Here is a more accurate definition taken from political science James Danziger:

"Ideological parties hold major programmatic goals (e.g., egalitarianism, ethnic solidarity, Islamic fundamentalism) and are deeply committed to the implementation of these goals to achieve comprehensive changes in the sociopolitical order. Ideological parties are usually extreme within the context of their particular political culture." Examples include the American Libertarian Party, North Korean Communist Party, and the German Green Party.

In America, we are well established with pragmatic parties which are oriented towards incremental or moderate policy change, hold more flexible goals, and will either shift or expand their positions and platforms to appeal to voters. Obviously, the Democratic and Republican parties practice this behavior.