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CONTINGENCIES - NARRATIVE (Details) | Apr. 08, 2020 USD ($) | Apr. 08, 2020 KRW (₩) | Mar. 27, 2019 USD ($) | Mar. 27, 2019 KRW (₩) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Deposits Assets, Noncurrent |  |  |  |  | $ 12,296,000 | $ 12,571,000 | $ 6,900,000
LGE |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payments for Deposits | $ 5,000,000.0 | ₩ 5,916,845,454 |  |  |  |  |
Payments for Deposits | $ 5,000,000.0 | ₩ 5,916,845,454 |  |  |  |  |
Samsung vs. Immersion | Withholding taxes on royalty payments |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation, amount awarded to other party |  |  | $ 6,900,000 | ₩ 7,841,324,165 |  |  |
Litigation, arbitration costs |  |  | $ 871,454 |  |  |  |

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