Citrus-Garlic Flank Steak

lean flank steak 2 tbsp vegetable oil 1/4 cup fresh orange juice (about 1 orange) 2 tbsp lime juice (about 1 lime) 1/2 jalapeno, finely diced 2 tbsp cilantro, chopped 3 cloves garlic, minced 1/2 tsp cumin 1/2 tsp oregano 1/2 tsp salt 1/2 tsp pepper