Semantic UI nested table shows up in single cell of parent - css

Question

I'm trying to create (using Semantic-UI and knockoutjs) a data table where each row has an expandable item (accordion) to show a sub-table of data related to the expanded row.
I have tried to use colspan="4" on my sub-table's <td> element, to no avail. No matter what I try, the sub-table seems to only exist within the first column of the parent table. The jsfiddle below demonstrates the issue better than my description, I'm sure.
https://jsfiddle.net/xpvt214o/908333/
This may be a simple CSS issue -- I'm no expert -- but nothing I've tried works for me. I also tried wrapping the sub-table as a <div>, but that seemed to break the accordion from collapsing.

Answer 1

<table class="ui celled table accordion">
<thead><tr>
<th ></th>
<th >ID</th>
<th>Name</th>
<th >FK1 ID</th>
<th >FK2 ID</th>
</tr></thead>
<tbody data-bind="foreach: arrayVM">
<tr class="ui title">
<td><i class="dropdown icon"></i></td>
<td data-bind="text: id"></td>
<td data-bind="text: name"></td>
<td data-bind="text: fk1id"></td>
<td data-bind="text: fk2id"></td>
</tr>
<tr style="display:none">
<td colspan="5" class="ui content">
<table class="ui inverted celled table" style="width:700px">
<tbody>
<tr>
<td><i class="ui logo add icon"></i></td>
<td data-bind="text: id"></td>
<td>column2</td>
<td>column3</td>
<td>column4</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>