NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Building, Equipment and Leasehold Improvements
Total	49,669us-gaap_PropertyPlantAndEquipmentGross	$ 61,730us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	(40,958)	(48,761)
Building, equipment and leasehold improvements, net	8,711us-gaap_PropertyPlantAndEquipmentNet	12,969us-gaap_PropertyPlantAndEquipmentNet
Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	1 year
Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	25 years
Building and leasehold improvements
Building, Equipment and Leasehold Improvements
Total	8,003	21,265
Building and leasehold improvements \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	25 years
Equipment and tooling
Building, Equipment and Leasehold Improvements
Total	5,871	5,517
Equipment and tooling \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Equipment and tooling \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	10 years
Computer equipment and software
Building, Equipment and Leasehold Improvements
Total	24,490	23,922
Computer equipment and software \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	3 years
Computer equipment and software \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Furniture and fixtures
Building, Equipment and Leasehold Improvements
Total	2,572	2,560
Furniture and fixtures \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Furniture and fixtures \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	7 years
Demo and test equipment
Building, Equipment and Leasehold Improvements
Total	8,596	8,331
Demo and test equipment \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	2 years
Demo and test equipment \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Leased equipment
Building, Equipment and Leasehold Improvements
Total	63	63
Leased equipment \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	1 year
Leased equipment \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	2 years
Motor vehicles
Building, Equipment and Leasehold Improvements
Total	74	$ 72
Motor vehicles \| Minimum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	3 years
Motor vehicles \| Maximum
Building, Equipment and Leasehold Improvements
Estimated Useful Lives	5 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

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-Name Accounting Standards Codification

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

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+ References

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

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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

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+ References

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