Show web widget/answer bot only to signed-in users?

What would need to be done to only show the web widget/answer bot to only signed in users on the ZenDesk help center?

I believe the following should work, but it doesn't appear to be:

{{#if signed_in}}
<script type="text/javascript">
  zE('webWidget', 'show');
</script>
{{else}}
<script type="text/javascript">
  zE('webWidget', 'hide');
</script>
{{/if}}