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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, UTStarcom Hong Kong Holdings Ltd - Additional Information (Details) - UTStarcom Hong Kong Holdings Ltd. - Convertible bonds of private company - USD ($) $ in Millions			12 Months Ended
	Apr. 07, 2015	Aug. 31, 2012	Dec. 31, 2018	Dec. 31, 2015	Dec. 31, 2019
Payments to Acquire Investments		$ 20.0
Interest rate of debt securities (as a percent)		6.50%
Face amount of convertible debt	$ 20.0
Proceeds from sale of bond	$ 10.0
Ownership interest upon conversion of preference shares and convertible bonds	14.00%
Impairment charge on investment			$ 0.4	$ 6.5
Carrying amount of the investment					$ 3.1

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Rate of interest on investment.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Represents cost method ownership interest upon conversion of preference shares and convertible bonds.

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