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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2018 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |
Impairment charges for long-lived assets |  | $ 0 | $ 0 | $ 0 |  |
Impairment of goodwill | $ 0 | 0 | 0 | 0 |  |
Advertising expense |  | $ 1,000,000 | 1,100,000 | 700,000 |  |
Net accumulated gain or loss as a proportion of projected plan benefit obligation (as a percent) |  | 10.00% |  |  |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit |  | $ 0 |  |  |  |
Number of operating segments | segment |  | 2 |  |  |  |
Stockholders' equity | 295,913,000 | $ 295,913,000 | 258,302,000 | 252,446,000 |  | $ 228,250,000
Convertible debt (mezzanine equity) | 883,000 | 883,000 | 0 |  |  |
Additional Paid-in Capital |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Stockholders' equity | 2,387,039,000 | 2,387,039,000 | 2,353,559,000 | 2,327,359,000 |  | 2,296,795,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  | $ 1,400,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Convertible debt (mezzanine equity) | (900,000) | (900,000) |  |  |  |
Debt instrument, unamortized discount |  |  |  |  | $ 15,200,000 |
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital | Accounting Standards Update 2020-06 |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Stockholders' equity | $ (32,200,000) | $ (32,200,000) |  |  |  |
Minimum |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Lessee, operating lease, term of contract (in years) | 1 year | 1 year |  |  |  |
Maximum |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Lessee, operating lease, term of contract (in years) | 11 years | 11 years |  |  |  |
Furniture and fixtures |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Property, plant and equipment estimated useful life (in years) |  | 5 years |  |  |  |
Software |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Property, plant and equipment estimated useful life (in years) |  | 3 years |  |  |  |
Machinery and equipment |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Property, plant and equipment estimated useful life (in years) |  | 4 years |  |  |  |
Foreign Exchange Forward |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Derivative, term of contract (in months) |  | 3 months |  |  |  |
TVN |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Research and development tax credits receivables from French government |  | $ 5,700,000 | 4,500,000 | 4,700,000 |  |
Other Expense |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Remeasurement (gains) losses |  | $ 600,000 | $ 1,000,000 | $ 1,500,000 |  |

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