private function parseImageId($imageId)
    {
        $idArray = explode('-', $imageId);

        if (count($idArray) == 2) {
            return array_merge($idArray, [null]);
        } elseif (count($idArray) == 3) {
            return $idArray;
        }

        throw new Exceptions\NotFoundException("Invalid image ID {$imageId}");
    }