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RESTRUCTURING (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Restructuring Reserve [Roll Forward]    
Balance at beginning of period   $ 612us-gaap_RestructuringReserve
Other Restructuring charges 770us-gaap_OtherRestructuringCosts 430us-gaap_OtherRestructuringCosts
Settlements (554)us-gaap_PaymentsForRestructuring (1,042)us-gaap_PaymentsForRestructuring
Balance at end of period 216us-gaap_RestructuringReserve  
Termination Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period   163us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Other Restructuring charges 250us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
359us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Settlements (60)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
(522)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Balance at end of period 190us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
 
Facility Costs And Contract Termination [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period   65us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
Other Restructuring charges 463us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
71us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
Settlements (437)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
(136)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
Balance at end of period 26us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= isns_FacilityCostsAndContractTerminationMember
 
Inventory Charges [Member]    
Restructuring Reserve [Roll Forward]    
Balance at beginning of period   384us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= isns_InventoryChargesMember
Other Restructuring charges 57us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= isns_InventoryChargesMember
 
Settlements $ (57)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= isns_InventoryChargesMember
$ (384)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= isns_InventoryChargesMember