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Balance Sheet Details (Details Textual) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Balance Sheet Details (Textual) [Abstract]
Net unrealized gain	$ 9,000

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- Definition

Net unrealized gain

+ References

No definition available.

+ Details

Name:	nvtl_NetUnrealizedGain
Namespace Prefix:	nvtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	nvtl_NetUnrealizedGainTextualAbstract
Namespace Prefix:	nvtl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration