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FINANCING ARRANGEMENTS - Convertible Senior Notes (Details) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2021 USD ($) | Apr. 30, 2021 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2019 USD ($) | May 31, 2016 $ / shares | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 8,858,000 | $ 210,296,000 | $ 107,674,000 |  |  | $ 395,046,000 |  |
Convertible senior notes, net |  |  | 224,923,000 | 223,403,000 |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 0 | 5,090,000 | 0 |  |  |  |  |
Share price (in usd per share) | $ / shares |  |  | $ 8,580,000 |  |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | (18,969,000) |  |  | (79,000) |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  |  |  | $ 19,000,000 |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 2,322,672,000 | 2,294,215,000 | 2,348,114,000 |  |  | 2,310,393,000 |  |
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | (64,319,000) | $ 2,700,000 |  |  |  |
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  | 67,000,000 |  |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ (1,394,477,000) | (1,156,868,000) | (1,320,886,000) |  |  | (1,032,876,000) |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | $ 45,350,000 |  |  | $ (79,000) |  |
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  | $ 48,000,000 |  |  |
Senior Notes | 3.25% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  |  |  |  |  |  |  |  |  | 3.25%
Principal amount |  |  |  |  |  |  |  |  |  | $ 250,000,000
Debt effective interest rate |  |  | 3.76% |  | 9.75% |  |  |  |  |
Aggregate purchase price | $ 255,000,000 |  |  |  |  |  |  |  |  |
Repurchased debt outstanding principal amount | 250,000,000 |  |  |  |  |  |  |  |  |
Debt repurchase accrued interest amount | 1,000,000 |  |  |  |  |  |  |  |  |
Debt repurchase prepayment penalty | 4,000,000 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 5,100,000 |  |  |  |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 108.00 |
Senior Notes | 3.25% Convertible Senior Notes due 2022 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 170.00 |
Senior Notes | 1.125% Convertible senior notes due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt stated interest rate |  | 1.125% |  |  |  |  |  |  |  |
Principal amount |  | $ 230,000,000 | $ 230,000,000 | 230,000,000 |  |  |  |  |  |
Debt effective interest rate |  |  | 1.83% |  |  |  |  |  |  |
Net proceeds from debt |  | 222,100,000 |  |  |  |  |  |  |  |
Proceeds from debt used for capped call transactions payment |  | $ 27,400,000 |  |  |  |  |  |  |  |
Debt convertible, conversion ratio |  | 0.0146800 |  |  |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares |  | $ 68.12 |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 7,800,000 |  |  |  |  |  |  |
Estimated fair value of convertible notes |  |  | $ 133,100,000 | $ 183,300,000 |  |  |  |  |  |
Debt conversion price, premium on stock price |  | 100.00% |  |  |  |  |  |  |  |
Senior Notes | 1.125% Convertible senior notes due 2026 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares |  | $ 104.80 |  |  |  |  |  |  |  |

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