Datasets:
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<tr>
<th></th>
<th>Balance at Beginning of Period</th>
<th>Charged to Costs and Expenses</th>
<th>Write-Offs</th>
<th>Balance at End of Period</th>
</tr>
<tr>
<td>Year ended December 31, 2006:</td>
<td>$ 38</td>
<td>$ 6</td>
<td>$ (4)</td>
<td>$ 40</td>
</tr>
<tr>
<td>Year ended December 31, 2007:</td>
<td>40</td>
<td>10</td>
<td>(1)</td>
<td>49</td>
</tr>
</table> |