Intangible Assets - Schedule of Amortizable Purchased Intangible Assets from 2010 Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross	$ 42,520	$ 42,520
Accumulated Amortization	(11,424)	(10,752)
Accumulated Impairment	(29,749)	(29,749)
Net	1,347	2,019
Developed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	26,000	26,000
Accumulated Amortization	(6,371)	(6,120)
Accumulated Impairment	(19,547)	(19,547)
Net	82	333
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	12,800	12,800
Accumulated Amortization	(3,053)	(2,665)
Accumulated Impairment	(8,582)	(8,582)
Net	1,165	1,553
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	3,720	3,720
Accumulated Amortization	(2,000)	(1,967)
Accumulated Impairment	(1,620)	(1,620)
Net	$ 100	$ 133

Intangible assets impaired accumulated impairment loss.

No definition available.

Name:	mifi_IntangibleAssetsImpairedAccumulatedImpairmentLoss
Namespace Prefix:	mifi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant