SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash, Cash Equivalents, Marketable Investments, and Long-Term Investments [Abstract]
Highly liquid investments with stated maturities, minimum	3 months
Highly liquid investments with stated maturities, maximum	3 months
Long term investment marketable period	1 year
ARS investment, at fair Value	$ 0	$ 3,000,000
Impairment of Marketable Investments [Abstract]
Other than temporary impairment losses	0	0	0
Concentration of Credit Risk and Other Risks and Uncertainties [Abstract]
Number of major banks used by entity	3
Average maturity period of interest rate of auction securities	18 months
Revenue from external customers, domestic	41.00%	39.00%	36.00%
Revenue from external customers, international	59.00%	61.00%	64.00%
Inventory [Abstract]
Inventories estimated useful lives	2 years
Property, Plant and Equipment [Line Items]
Depreciation expense	436,000	446,000	525,000
Goodwill and Intangible Assets [Line Items]
Impairment charge	0	0	0
Warranty Obligations [Abstract]
Standard warranty period	1 year
Revenue Recognition [Abstract]
Service revenue	17,220,000	13,411,000	13,231,000
Advertising Costs [Abstract]
Advertising Expense	$ 1,300,000	$ 1,300,000	$ 947,000
Income Taxes [Abstract]
Uncertain income tax position minimum rate (in hundredths)	50.00%
Segments [Abstract]
Long-lived assets maintained in United States (in hundredths)	85.00%	77.00%
Minimum [Member]
Goodwill and Intangible Assets [Line Items]
Intangible asset, useful life	11 months
Maximum [Member]
Goodwill and Intangible Assets [Line Items]
Intangible asset, useful life	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	Lesser of useful life or term of lease
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	3 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful lives	3 years