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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. + References No definition available. + Details
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- Definition Percentage price of original principal amount of debt plus accrued interest at which debt can be redeemed by the issuer following occurrence of certain tax related events. + References No definition available. + Details
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- Definition The cash inflow from the additional issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References No definition available. + Details
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- Definition The cash inflow from the initial issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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