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CONVERTIBLE NOTES AND OTHER DEBTS - Narrative (Details) $ / shares in Units, $ in Thousands, € in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jun. 26, 2020 day | Jun. 02, 2020 USD ($) | Jun. 30, 2020 EUR (€) | Apr. 30, 2020 CHF (SFr) | Sep. 25, 2020 USD ($) $ / shares | Sep. 27, 2019 USD ($) | Jun. 26, 2020 USD ($) | Sep. 25, 2020 USD ($) $ / shares | Dec. 31, 2021 USD ($) day $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) day | Jun. 30, 2020 USD ($) | Dec. 19, 2019 USD ($) | Sep. 13, 2019 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  |
Convertible debt, non-current |  |  |  |  |  |  |  |  | $ 98,941 | $ 129,507 |  |  |  |  |
Fair value of 2022 Notes used to settle 2020 Notes |  |  |  |  |  |  |  |  | 0 | 44,357 | $ 0 |  |  |  |
Loss on convertible debt extinguishment |  |  |  |  |  |  |  |  | 0 | 1,362 | 5,695 |  |  |  |
Reclassification from APIC to convertible debt in mezzanine equity |  |  |  |  |  |  |  |  | 883 | 0 |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  | 0 | 7,999 | 109,603 |  |  |  |
Relief loans |  |  |  |  |  |  |  |  | 5,651 | 6,694 |  |  |  |  |
Societe Generale S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.51% |  |  |
Proceeds from loans | € |  |  | € 5 |  |  |  |  |  |  |  |  |  |  |  |
Relief loans |  |  |  |  |  |  |  |  | $ 5,700 |  |  |  |  |  |
UBS Switzerland AG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Proceeds from loans | SFr |  |  |  | SFr 500,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | JPMORGAN CHASE BANK N.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Line of credit facility, fair value of amount outstanding |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Revolving Credit Facility | Maximum | JPMORGAN CHASE BANK N.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |
One Month LIBOR | Revolving Credit Facility | JPMORGAN CHASE BANK N.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |
LIBOR for interest period of one, two or three months | Revolving Credit Facility | JPMORGAN CHASE BANK N.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Loans Backed By French Research And Development Tax Credit Receivables | TVN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 1.90% |  |  |  |  |  |
Convertible Note due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 37,700 |  |  |  |  |  |  | $ 37,707 | 37,707 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  |  | 173.9978 |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 5.75 |  |  |  |  |  |
Convertible debt, non-current |  |  |  |  |  |  |  |  | $ 36,824 | 35,925 |  |  |  |  |
Fair value of 2022 Notes used to settle 2020 Notes |  | 44,400 |  |  |  |  |  |  |  | 44,400 |  |  |  |  |
Carrying amount of equity component of debt instrument |  | 8,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt |  | 36,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  | $ 1,700 |  |  |  |  |  |  | $ 672 | 1,357 |  |  |  |  |
Other significant noncash transaction, value of consideration received |  |  |  |  |  |  | $ 37,700 |  |  |  |  |  |  |  |
Convertible Note due 2022 | Stock price greater or equal 130 percent of Note Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | day | 20 |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 30 |  |  |  |  |  |  |  | 30 |  |  |  |  |  |
Threshold of stock price trigger (as a percent) | 130.00% |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Convertible Note due 2022 | Note price less than 98 percent of stock price times conversion rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | day | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold of stock price trigger (as a percent) | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Note due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 115,500 | 115,500 |  |  |  | $ 115,500 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  |  | 115.5001 |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 8.66 |  |  |  |  |  |
Convertible debt, non-current |  |  |  |  |  |  |  |  | $ 98,941 | 93,582 |  |  |  |  |
Carrying amount of equity component of debt instrument |  |  |  |  | $ 24,900 |  |  | $ 24,900 |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  |  |  |  | $ 14,576 | 19,294 |  |  |  |  |
Convertible Note due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 8,100 |  |  | $ 128,300
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  | 173.9978 |  |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 5.75 |  |  | $ 5.75 |  |  |  |  |  |  |
Carrying amount of equity component of debt instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,100
Debt instrument, repurchase amount |  |  |  |  | $ 109,600 |  |  | $ 109,600 |  |  |  |  |  |  |
Loss on convertible debt extinguishment |  |  |  |  |  |  | 800 |  |  | 500 |  |  |  |  |
Reclassification from APIC to convertible debt in mezzanine equity |  |  |  |  |  |  |  |  |  |  | $ 2,400 |  |  |  |
Other significant noncash transaction, value of consideration received |  |  |  |  |  |  | $ 37,700 |  |  |  |  |  |  |  |
Convertible Note due 2020 | Stock price greater or equal 130 percent of Note Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | day |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Threshold of stock price trigger (as a percent) |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Convertible Note due 2020 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 45,800 |  |  |  |
Convertible Debt | Convertible Note due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on convertible debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 5,700 |  |  |  |
Convertible Debt | Long-term Debt | Convertible Note due 2020 | Privately Negotiated Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  | $ 82,500 |  |  |  |  |  |  |  |  |  |
Convertible Debt | Additional Paid-in Capital | Convertible Note due 2020 | Privately Negotiated Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  | $ 27,100 |  |  |  |  |  |  |  |  |
Convertible Debt Settled in Cash and Company's Stocks | Convertible Note due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  | 7,800 |  |  |  |  |
Convertible Debt Settled in Cash | Convertible Note due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |

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