[destus]

Maria Krylova,
заменить

<script src="http://code.angularjs.org/1.0.7/angular.min.js" ></script>

на

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.5/angular.min.js"></script>

или заменить

<button ng-click="toggleDetails()" class="btn btn-xs btn-primary pull-right" type="button">
                  {{showDetails ? 'Hide Details':'Show Details'}}
</button>

на

<button ng-show='showDetails' ng-click="toggleDetails()" class="btn btn-xs btn-primary pull-right" type="button">
          Hide Details
</button>
<button ng-show='!showDetails' ng-click="toggleDetails()" class="btn btn-xs btn-primary pull-right" type="button">
          Show Details
</button>

https://plnkr.co/edit/nu5Pt8J0uYgoUEt1EFdk?p=preview