We pushed some updates to the IDE today - most of them were backend changes, but there is one new feature: deleting devices.
To remove a device from your IDE, click on the Device Settings gear for that device, then select “Delete Device.” It will disappear from your account until the next time the devices comes online (while configured to your account).
While not required, we recommend using the “Clear Wireless Configuration” option in the BlinkUp app before you delete the device from your account so that it doesn’t accidentally get added again 
Here are some action shots:
Selecting the Device
Deleting the Device
