SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)	12 Months Ended
Dec. 31, 2016 USD ($) financial_institution	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Number of financial institutions \| financial_institution	2
Held-to-maturity Securities [Abstract]
Unrecognized holding loss	$ 2,000
Fair value of debt securities	4,700,000
Allowance for doubtful accounts receivable	0
Revenues	302,000	$ 0
Income Taxes
Unrecognized tax benefits	0	0
Income tax penalties and interest expense	0	$ 0
Minimum
Property and Equipment
Useful lives		3 years
Maximum
Property and Equipment
Useful lives		5 years
Debt Securities \| Certificates of Deposit
Held-to-maturity Securities [Abstract]
Amortized cost value of debt securities		$ 3,000,000
Unrecognized holding loss		7,000
Fair value of debt securities	747,000	3,000,000
Debt Securities \| Certificates of Deposit \| Certificate of Deposit, Maturing January 2017
Held-to-maturity Securities [Abstract]
Fair value of debt securities	249,000
Debt Securities \| Certificates of Deposit \| Certificate of Deposit, Maturing February 2017
Held-to-maturity Securities [Abstract]
Fair value of debt securities	249,000
Debt Securities \| Certificates of Deposit \| Certificate of Deposit, Maturing March 2017
Held-to-maturity Securities [Abstract]
Fair value of debt securities	249,000
Commercial Paper
Held-to-maturity Securities [Abstract]
Fair value of debt securities	4,000,000
Commercial Paper \| Commercial Paper, Maturing January 2017
Held-to-maturity Securities [Abstract]
Fair value of debt securities	3,000,000
Commercial Paper \| Commercial Paper, Maturing February 2017
Held-to-maturity Securities [Abstract]
Fair value of debt securities	1,000,000
Foreign Debt Securities \| Certificates of Deposit
Held-to-maturity Securities [Abstract]
Investment income	18,000	$ 11,000
Development of Filter Designs
Held-to-maturity Securities [Abstract]
Revenues	246,000
Deferred revenue	325,000
Milestone Achievement
Held-to-maturity Securities [Abstract]
Revenues	45,000
Other Revenues
Held-to-maturity Securities [Abstract]
Revenues	11,000
GVR Trade S.A.
Held-to-maturity Securities [Abstract]
Revenues	$ 61,000

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