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Concentrations (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk
Export sales of net sales	1.00%isig_PercentageOfExportSalesToNetSales	1.00%isig_PercentageOfExportSalesToNetSales
Net sales
Concentration Risk
Number of customers	2isig_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember	1isig_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember
Net sales | Customer one
Concentration Risk
Customer's percentage of net sales	33.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = isig_CustomerOneMember	31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = isig_CustomerOneMember
Net sales | Customer two
Concentration Risk
Customer's percentage of net sales	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_MajorCustomersAxis = isig_CustomerTwoMember
Accounts receivable
Concentration Risk
Number of customers	1isig_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember
Accounts receivable | Customer one
Concentration Risk
Customer's percentage of net sales	48.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = isig_CustomerOneMember	47.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = isig_CustomerOneMember
Accounts receivable | Customer two
Concentration Risk
Customer's percentage of net sales		14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = isig_CustomerTwoMember

X

- Definition

Number Of Customers

+ References

No definition available.

+ Details

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X

- Definition

Represents the maximum percentage of sales from export sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	isig_
Data Type:	num:percentItemType
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- Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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X

- Details

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Period Type: