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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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DEBT AND FINANCING ARRANGEMENTS - Narrative (Details)			6 Months Ended
DEBT AND FINANCING ARRANGEMENTS - Narrative (Details)	Nov. 30, 2020 USD ($)	Sep. 22, 2020 USD ($) numberOfDays $ / shares	Jun. 30, 2022 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount		$ 230,000,000
Stated percentage		1.00%
Proceeds from issuance of convertible senior notes, net of issuance costs paid of $6,900		$ 222,700,000
Adjustments to additional paid in capital, issuance of capped calls		$ 26,500,000
Threshold consecutive trading days \| numberOfDays		10,000
Threshold percentage of stock price trigger		98.00%
Conversion ratio		11.7457
Conversion price (in dollars per share) \| $ / shares		$ 85,140
Redemption period, days before maturity date		36 days
Redemption price, percentage		100.00%
Threshold principal outstanding amount for partial redemption			$ 75,000,000
Required compliance period, period after written notice		60 days
Percentage of holders to require written notice of noncompliance		25.00%	25.00%
Amount of other debt called due		$ 35,000,000
Covenant noncompliance, period of additional interest			365 days
Liability component, discount rate			6.50%
Strike price (in dollars per share) \| $ / shares		$ 85.14
Cap price (in dollars per share) \| $ / shares		$ 128.51
Outstanding borrowings			$ 0
Unused borrowing capacity			$ 60,000,000
Maximum borrowing capacity, percentage of accounts receivable			85.00%
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Additional Paid in Capital			$ 51,500,000
Debt Covenant Noncompliance, Scenario One
Debt Instrument [Line Items]
Covenant noncompliance, period of additional interest			180 years
Covenant noncompliance, additional interest, stated percentage			0.25%
Debt Covenant Noncompliance, Scenario Two
Debt Instrument [Line Items]
Covenant noncompliance, additional interest, stated percentage			0.50%
Debt Covenant Noncompliance, Scenario Two \| Minimum
Debt Instrument [Line Items]
Covenant noncompliance, period of additional interest			181 days
Debt Covenant Noncompliance, Scenario Two \| Maximum
Debt Instrument [Line Items]
Covenant noncompliance, period of additional interest			365 days
Debt Conversion Scenario One
Debt Instrument [Line Items]
Threshold trading days \| numberOfDays		20,000
Threshold consecutive trading days \| numberOfDays		30,000
Threshold percentage of stock price trigger		130.00%
Debt Conversion Scenario Two
Debt Instrument [Line Items]
Threshold trading days \| numberOfDays		5,000
Debt Conversion Scenario Three
Debt Instrument [Line Items]
Threshold trading days \| numberOfDays		20
Threshold consecutive trading days \| numberOfDays		30
Threshold percentage of stock price trigger		130.00%
Convertible Senior Notes, Additional Principal Option
Debt Instrument [Line Items]
Debt instrument, face amount		$ 30,000,000
Senior Notes \| 2020 Convertible Senior Notes
Debt Instrument [Line Items]
Obligation to convert, period of failed compliance		3 days
Notice of change, period of failed compliance		1 day
Lines of credit
Debt Instrument [Line Items]
Debt instrument, interest rate			4.75%
Commitment fee percentage			0.15%
Revolving Credit Facility \| Lines of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 40,000,000			$ 50,000,000
Billing covenant period	12 months
Minimum cash plus liquidity requirement	$ 5,000,000
Cast to funded senior debt ratio				1.25
Unused borrowing capacity			$ 60,000,000
Revolving Credit Facility \| Lines of credit \| Minimum
Debt Instrument [Line Items]
Billing covenant	210,000,000
Revolving Credit Facility \| Lines of credit \| Maximum
Debt Instrument [Line Items]
Billing covenant	$ 255,000,000