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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Assets:
Marketable debt securities	$ 49,995,000	$ 0
Total	751,725,000	314,850,000
Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total	374,014,000	291,810,000
Significant Other Observable Inputs (Level 2)
Assets:
Total	377,711,000	23,040,000
Significant Unobservable Inputs (Level 3)
Assets:
Total	0	0
Money market funds
Assets:
Cash equivalents	374,014,000	291,810,000
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	374,014,000	291,810,000
Money market funds | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0	0
Money market funds | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0
Treasury discount notes
Assets:
Cash equivalents	324,995,000
Marketable debt securities	49,995,000
Treasury discount notes | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0
Marketable debt securities	0
Treasury discount notes | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	324,995,000
Marketable debt securities	49,995,000
Treasury discount notes | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Marketable debt securities	0
Time deposits
Assets:
Cash equivalents	2,721,000	23,040,000
Time deposits | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	0	0
Time deposits | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	2,721,000	23,040,000
Time deposits | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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