Liquidity (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Liquidity [Abstract]
Increase in revolving credit facility	$ 1.0

Line credit facility additional borrowing capacity.

No definition available.

Name:	ngnm_LineCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	ngnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant