I have variable which is negative numbers after $ sign (actually it shows currency with currency sign). Please tell me how to show minus currency in brackets with currency sign. I mean to say how to change var val=($125,220,328.00) if this is $- $125,220,328.00

My code is looks like this

1. function addCommas(nStr)
       {
        nStr += '';
        x = nStr.split('.');
        x1 = x[0];
        x2 = x.length > 1 ? '.' + x[1] : '';
        var rgx = /(\d+)(\d{3})/;
        while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
        }
        return x1 + x2;
       }
   
   
   
   
       function netAmount(){
        var net_amount =0;
        $('#productList tr:gt(1)').each(function() {
        var row_index= $(this).index();
        var qty= $('#productList tr:eq('+row_index+') td input[name="quantity"]').val().replace( /[^0-9\.]/g, '' );
        var price= $('#productList tr:eq('+row_index+') td input[name="purchase_price"]').val().replace( /[^0-9\.]/g, '' );
        net_amount+= +(parseFloat(qty*price).toFixed(2));
        $('input[name="net_ammount"]').val('$'+ addCommas(parseFloat(net_amount).toFixed(2)));
       
        });
       }
   
   

    

Now i want if net_amount is looks like -123225.32 then it show in input[name="net_ammount"] as ($123,225.32)