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CREDIT RISK AND CONCENTRATION (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CREDIT RISK AND CONCENTRATION [Abstract]
Increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio (as a percent)	10.00%
Accounts receivable balances	$ 17,936	$ 16,690
Customer Concentration Risk [Member] | Accounts Receivable [Member] | China Government Affiliated Entities [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Accounts receivable balances	$ 300	$ 6,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Affiliates of Softbank [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Concentration of risk (as a percent)	69.00%	65.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | China Government Affiliated Entities [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Concentration of risk (as a percent)	0.00%	0.00%	1.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Affiliates of Softbank [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Concentration of risk (as a percent)	47.00%	44.00%	55.00%
Countries Other than US [Member] | Credit Concentration Risk [Member] | Cash, Cash Equivalents and Short Term Investments [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Cash and cash equivalents and short-term investments	$ 64,400	$ 55,300
CHINA [Member] | Credit Concentration Risk [Member] | Cash, Cash Equivalents and Short Term Investments [Member] | Subsidiaries [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Cash and cash equivalents and short-term investments	$ 19,800	$ 14,500
CHINA [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
CREDIT RISK AND CONCENTRATION [Abstract]
Concentration of risk (as a percent)	8.00%	12.00%	4.00%

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a(1)
-Article 5

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 4
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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Represents the percentage of increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio.

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