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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in InCarda (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 06, 2020 USD ($) | Sep. 30, 2021 | Sep. 30, 2020 USD ($) shares | Dec. 31, 2021 USD ($) Director $ / shares | Dec. 31, 2020 USD ($)
Equity Investment |  |  |  |  |
Equity and long-term investments |  |  |  | $ 483,845,000 | $ 438,258,000
InCarda |  |  |  |  |
Equity Investment |  |  |  |  |
Number of Investee's Board members currently representing the Company | Director |  |  |  | 1 |
Number of the Investee's Board members | Director |  |  |  | 8 |
Equity investment ownership percentage |  |  |  | 13.00% | 13.40%
InCarda | Series C preferred stock and warrants |  |  |  |  |
Equity Investment |  |  |  |  |
Securities Purchase Agreement, Amount | $ 15,800,000 |  |  |  |
Amount of securities purchase agreement | $ 15,800,000 |  |  |  |
Unrealized gain from fair value changes in equity investments |  |  |  |  | $ 1,100,000
InCarda | Series C preferred stock |  |  |  |  |
Equity Investment |  |  |  |  |
Number of shares to be purchased under the securities purchase agreement | shares |  |  | 20,469,432 |  |
Securities Purchase Agreement, Amount |  |  | $ 800,000 |  |
Amount of securities purchase agreement |  |  | $ 800,000 |  |
Equity and long-term investments |  |  |  | $ 15,800,000 | 15,800,000
Unrealized loss from fair value changes in equity investments |  |  |  | (700,000) |
Impairment of equity investments |  |  |  | $ 0 | 0
InCarda | Warrants |  |  |  |  |
Equity Investment |  |  |  |  |
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares |  |  | 5,117,358 |  |
Exercise price of warrants | $ / shares |  |  |  | $ 0.7328 |
Extended Expiration Date |  | Mar. 31, 2022 |  |  |
Equity and long-term investments at fair value |  |  |  | $ 400,000 | $ 1,100,000

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- Definition Extended expiration date. + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=124268079&loc=d3e32787-111569 + Details
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