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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments accounted for at fair value | $ 780 | $ 650
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments accounted for at fair value | 779 | 654
Time Deposits | 2,247 | 630
Short-term Investments |  | 4,208
Warrant liabilities (Note 12) | (8,573) | (2,791)
Convertible Debentures (Note 11) |  | 16,382
Fair Value, Net Asset (Liability) | (5,547) | (13,681)
Fair Value, Measurements, Recurring [Member] | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments accounted for at fair value | 779 | 654
Time Deposits | 2,247 | 630
Short-term Investments |  | 0
Warrant liabilities (Note 12) | (8,573) | (2,791)
Convertible Debentures (Note 11) |  | 16,382
Fair Value, Net Asset (Liability) | (5,547) | (17,889)
Fair Value, Measurements, Recurring [Member] | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments accounted for at fair value | 0 | 0
Time Deposits | 0 | 0
Short-term Investments |  | 4,208
Warrant liabilities (Note 12) | 0 | 0
Convertible Debentures (Note 11) |  | 0
Fair Value, Net Asset (Liability) | 0 | 4,208
Fair Value, Measurements, Recurring [Member] | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments accounted for at fair value | 0 | 0
Time Deposits | 0 | 0
Short-term Investments |  | 0
Warrant liabilities (Note 12) | 0 | 0
Convertible Debentures (Note 11) |  | 0
Fair Value, Net Asset (Liability) | $ 0 | $ 0

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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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