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Shareholders' Equity (Details 5) (USD $)	1 Months Ended	12 Months Ended
	Aug. 15, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 03, 2013	Jul. 18, 2013
Stock option disclosures
Stock-based compensation expense		$ 403,000us-gaap_AllocatedShareBasedCompensationExpense	$ 533,000us-gaap_AllocatedShareBasedCompensationExpense
Stock Repurchase Plans
Repurchase of common stock, authorized				5,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Repurchase of common stock, shares	929,051us-gaap_StockRepurchasedDuringPeriodShares	787,000us-gaap_StockRepurchasedDuringPeriodShares
Price per share (in dollars per share)	$ 2.35us-gaap_TreasuryStockAcquiredAverageCostPerShare
Repurchase of common stock, net	2,200,000us-gaap_StockRepurchasedDuringPeriodValue	2,450,000us-gaap_StockRepurchasedDuringPeriodValue	2,328,000us-gaap_StockRepurchasedDuringPeriodValue
Minimum
Stock Repurchase Plans
Offered price per share under tender offer (in dollars per share)					$ 2.15isig_StockRepurchaseProgramOfferedPricePerShare / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Stock Repurchase Plans
Repurchase of common stock, authorized					12,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Offered price per share under tender offer (in dollars per share)					$ 2.35isig_StockRepurchaseProgramOfferedPricePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember
Employee stock purchase plan
Stock option disclosures
Maximum percent of base compensation contributed towards purchase of shares		10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Percent of market value for employee purchases		85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Employees purchased shares		27,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember	56,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Shares are reserved for future employee purchases		152,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Stock-based compensation expense		$ 26,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember	$ 34,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember

X

- Definition

Represents the per share price offered by the entity, at which the shares can be tendered by the entity's shareholders, under the stock repurchase plan.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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X

- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

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-Publisher FASB

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-Topic 718

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X

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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X

- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Amount of stock repurchase plan authorized.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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