$scope.money: {{ money }}
Try it:
<input type="text" usd ng-model="money" />
Check out the source for this page for more details. All we used was this for the main.js file:
'use strict';
var app = angular.module('app', [ 'input-usd' ]);
app.controller('MainCtrl', function ($scope) {
$scope.money = 86753.09;
});