Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Materials Inventory
Inventory raw materials noncurrent	$ 3.0	$ 3.4

Carrying amount, as of the balance sheet date, of unprocessed items that are to be consumed in the manufacturing or production process and are not expected to be sold during the next twelve months.

No definition available.

Name:	imi_InventoryRawMaterialsNoncurrent
Namespace Prefix:	imi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant