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Commitments and Contingencies - Narrative (Details) $ in Millions	Mar. 31, 2018 USD ($) shares
Commitments and Contingencies Disclosure [Abstract]
Cash payment accrued | $	$ 15.8
Number of shares subject to outcome of litigation (in shares) | shares	1,946,666

X

- Definition

Loss Contingency, Number Of Shares Subject To Litigation

+ References

No definition available.

+ Details

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Namespace Prefix:	insg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

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