SUMMARY OF ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Shipping and handling and credit card charges	$ 1,000	$ 1,000
Marketing expenses	1,221	2,750
Research and development expenses	1,100	1,162
Insured cash balance	250
Uninsured cash balance	559
Cash and cash equivalents	45,500	$ 82,935	$ 78,589	$ 75,945
Money market accounts	42,700
Payment for intangible assets	40,019
Valuation allowance increase (decrease)	500	$ (200)
Increase in uncertain tax positions	$ 1,150
Estimated annual effective income tax rate	34.90%
Minimum [Member]
Estimated useful life, Property and equipment	3 years
Estimated useful lives, Intangible assets	1 year
Maximum [Member]
Estimated useful life, Property and equipment	15 years
Estimated useful lives, Intangible assets	17 years
Accounts Receivable [Member] | Telecommunications Carrier One [Member]
Percentage of concentration risk			11.00%
Accounts Receivable [Member] | One U.S. retail [Member]
Percentage of concentration risk	11.00%		14.00%
Single Financial Institution, Concentration Risk [Member]
Cash and cash equivalents	$ 1,600
United States [Member]
Cash and cash equivalents	45,100
Israel [Member]
Cash and cash equivalents	$ 400
Estimated annual effective income tax rate	25.00%