NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - EQUIPMENT AND LEASEHOLD IMPROVEMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Equipment and Leasehold Improvements
Total	$ 50,668	$ 49,669
Less accumulated depreciation and amortization	(44,191)	(40,958)
Equipment and leasehold improvements, net	$ 6,477	8,711
Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	1 year
Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	25 years
Leasehold improvements
Equipment and Leasehold Improvements
Total	$ 7,789	8,003
Leasehold improvements \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	25 years
Equipment and tooling
Equipment and Leasehold Improvements
Total	$ 6,759	5,871
Equipment and tooling \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Equipment and tooling \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	10 years
Computer equipment and software
Equipment and Leasehold Improvements
Total	$ 24,616	24,490
Computer equipment and software \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	3 years
Computer equipment and software \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Furniture and fixtures
Equipment and Leasehold Improvements
Total	$ 2,572	2,572
Furniture and fixtures \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Furniture and fixtures \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	7 years
Demo and test equipment
Equipment and Leasehold Improvements
Total	$ 8,782	8,596
Demo and test equipment \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	2 years
Demo and test equipment \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	5 years
Leased equipment
Equipment and Leasehold Improvements
Total	$ 63	63
Leased equipment \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	1 year
Leased equipment \| Maximum
Equipment and Leasehold Improvements
Estimated Useful Lives	2 years
Motor vehicles
Equipment and Leasehold Improvements
Total	$ 87	$ 74
Motor vehicles \| Minimum
Equipment and Leasehold Improvements
Estimated Useful Lives	3 years
Motor vehicles \| Maximum
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
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: 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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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