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CREDIT RISK AND CONCENTRATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CREDIT RISK AND CONCENTRATION
Increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio	10.00%
Credit risk and concentration
Number of levels of operations	3
Accounts receivable balances	15,000,000	20,168,000
Credit risk concentration | Cash, cash equivalents and short-term investments | Countries outside US
Credit risk and concentration
Cash and cash equivalents and short-term investments	94,500,000	205,200,000
Credit risk concentration | Cash, cash equivalents and short-term investments | China | Subsidiary
Credit risk and concentration
Cash and cash equivalents and short-term investments	49,300,000	134,100,000
Customer concentration | Accounts receivable | Affiliates of Softbank
Credit risk and concentration
Concentration of risk (as a percent)	80.00%	42.00%
Customer concentration | Accounts receivable | China government affiliated entities
Credit risk and concentration
Accounts receivable balances	6,300,000	32,800,000
Customer concentration | Net revenues | Affiliates of Softbank
Credit risk and concentration
Concentration of risk (as a percent)	49.00%	29.00%	16.00%
Customer concentration | Net revenues | China government affiliated entities
Credit risk and concentration
Concentration of risk (as a percent)	42.00%	45.00%	53.00%
Country risks | Net revenues | China
Credit risk and concentration
Concentration of risk (as a percent)	21.00%	49.00%	57.00%

X

- 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)

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 8, 9, 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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.

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Represents the number of levels of operations of most Chinese telecommunication carriers.

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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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No definition available.

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