v2.4.0.8

Segment Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2012 Segments | Dec. 31, 2011 Segments
Segment Information (Textual) [Abstract] |  |
Number of reportable segments | 1 | 1

X
- Details
Name: | ngmc_SegmentInformationTextualAbstract
Namespace Prefix: | ngmc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration