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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 14, 2014 | Feb. 28, 2015 | Mar. 31, 2007 | Sep. 30, 2004 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2008 | Dec. 30, 2016
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Per share price of investment |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.00
ImmenStar, Inc. | Series A preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Release from escrow deposit |  |  |  |  |  |  |  |  |  |  |  | $ 0.2 |
Payments to Acquire Investments |  |  |  | $ 2.0 |  |  |  |  |  |  |  |  |
Cortina |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received in exchange for investment |  |  | $ 1.8 |  |  |  |  |  |  |  |  |  |
Cost-method Investments, Realized Losses, Excluding Other than Temporary Impairments |  |  |  |  |  |  |  |  | $ 1.5 |  |  |  |
Investment, ownership interest (as a percent) | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Cortina | Series D preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received in exchange for investment |  |  | 3,600,000 |  |  |  |  |  |  |  |  | 400,000 |
Per share price of investment |  |  | $ 0.837 |  |  |  |  |  |  |  |  | $ 0.837 |
Inphi Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares received in exchange for investment | 124,395 |  |  |  |  |  |  |  |  |  |  |  |
Release from escrow deposit |  |  |  |  | $ 0.1 | $ 0.3 |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities |  |  |  |  |  |  |  |  |  |  | $ 2.3 |  |
Unrealized gain from available-for-sale investments |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |
Number of shares of equity securities sold |  | 124,395 |  |  |  |  |  | 124,395 |  |  |  |  |
Proceeds from sale of equity |  | $ 2.4 |  |  |  |  |  | $ 2.4 |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains |  | $ 0.6 |  |  |  |  |  | $ 0.6 |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  |  | $ 0.7 |  |  | $ 1.0 |  |  |
Net carrying value of assets sold |  |  |  |  |  | $ 0.0 | $ 0.0 |  |  | $ 0.0 |  |  |

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