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CONVERTIBLE NOTES (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 16, 2020 USD ($) D item $ / shares	Dec. 31, 2020 USD ($)
CONVERTIBLE NOTES
Amortization of financing costs		$ 388
Interest expense		1,677
2020 Notes
CONVERTIBLE NOTES
Proceeds from initial issuance of convertible notes	$ 200,000
Period of option for additional issuance	30 days
Proceeds from additional issuance of convertible notes	$ 30,000
Interest rate (as a percent)	2.50%
Conversion rate	27.2707
Conversion rate initial principal amount	$ 1,000
Conversion price (in dollars per share) | $ / shares	$ 36.67
Sales price of common stock as percentage of conversion price for redemption at Company's option	130.00%
Number of trading days that threshold percentage exceeds stock price for trigger of redemption at Company's option | item	20
Period of consecutive trading days that the threshold of trading days must fall within for trigger of redemption at Company's option | D	30
Redemption prices as percentage of outstanding principal amount plus accrued and unpaid interest following occurrence of certain tax related events	100.00%
Carrying value of convertible notes		223,214
Unamortized issuance costs		$ 6,786
Effective interest rate (as a percent)		3.18%

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- Definition

The period of option available to initial purchasers of convertible debt instruments for purchase of additional convertible debt instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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The price per share of the conversion feature embedded in the debt instrument.

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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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