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CONVERTIBLE NOTES AND OTHER DEBTS - Other (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Financing from French government agencies related to various government incentive programs | $ 12,259 | $ 14,974
Relief loans | 5,651 | 6,694
Term loans | $ 71 | $ 167
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term portion | Long-term portion
Obligations under finance leases | $ 0 | $ 22
Total debt obligations | 17,981 | 21,857
Less: current portion | (4,992) | (11,771)
Long-term portion | 12,989 | 10,086
Loans payable to bank | $ 12,259 | $ 14,974
TVN | Loans Backed By French Research And Development Tax Credit Receivables |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.90% |

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