Format the counter (thousands separator)

document.addEventListener('facetwp-loaded', function() {
    fUtil('.facetwp-counter').each(function() {
        var count = parseInt(fUtil(this).text().slice(1, -1));
        if (999 < count) {
            var new_count = count.toLocaleString('en-US');
            fUtil(this).text('(' + new_count + ')');
        }
    });
});