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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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