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FAIR VALUE MEASUREMENT - Additional Information (Details) - Fair Value, Inputs, Level 3 $ in Thousands	Sep. 30, 2021 USD ($)
2021 Notes
Short-term Debt	$ 3,270
Convertible Debt, Fair Value Disclosures	3,400
2024 Notes
Long-term Debt, Gross	28,750
Convertible Debt, Fair Value Disclosures	$ 39,800

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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