Query Customers With No Orders

I'm trying to pull a listing of customers for which no orders appear in the order table.

table names are "customers" and "orders"
both tables contain a column named "idCustomer"

I thought performing a subquery that would sum up the total of order numbers would give me a means by which I could determine this, but I'm still getting incorrect results.

select customers.idcustomer,customers.customercompany, Orders.idorder,Orders.idcustomer,orders.orderDate from customers inner join orders on customers.idcustomer = orders.idcustomer where customers.idcustomer in(select count(idorder) as totalorders from orders where orders.idcustomer = customers.idcustomer and totalorders = 0)