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CREDIT RISK AND CONCENTRATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk
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%
Cash, Cash Equivalents and Short Term Investments | Countries Other than US | Credit Concentration Risk
Concentration Risk
Cash and cash equivalents and short-term investments	$ 46.0	$ 53.8
Accounts Receivable | Customer Concentration Risk | Softbank and affiliates
Concentration Risk
Concentration of risk (as a percent)	2.00%	57.00%
Sales Revenue, Net | Customer Concentration Risk | Softbank and affiliates
Concentration Risk
Concentration of risk (as a percent)	40.00%	50.00%	47.00%
Sales Revenue, Net | Customer Concentration Risk | Bharat Sanchar Nigam Ltd. and affiliates.
Concentration Risk
Concentration of risk (as a percent)	39.00%	35.00%	17.00%
Sales Revenue, Net | China | Geographic Concentration Risk
Concentration Risk
Concentration of risk (as a percent)	3.00%	5.00%	8.00%
Subsidiaries | Cash, Cash Equivalents and Short Term Investments | China | Credit Concentration Risk
Concentration Risk
Cash and cash equivalents and short-term investments	$ 7.9	$ 13.5

X

- 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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 275
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