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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value on a Recurring Basis
Total	$ 211,251	$ 254,454
Money market funds
Fair Value on a Recurring Basis
Total	19,805	4,356
U.S. Treasury securities
Fair Value on a Recurring Basis
Total	21,160	10,705
Municipal securities
Fair Value on a Recurring Basis
Total	2,999
Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	16,249	28,757
Commercial paper
Fair Value on a Recurring Basis
Total	77,440	112,409
Corporate notes
Fair Value on a Recurring Basis
Total	73,598	97,866
Equity Investment
Fair Value on a Recurring Basis
Total		361
Level 1
Fair Value on a Recurring Basis
Total	19,805	4,356
Level 1 | Money market funds
Fair Value on a Recurring Basis
Total	19,805	4,356
Level 2
Fair Value on a Recurring Basis
Total	191,446	250,098
Level 2 | U.S. Treasury securities
Fair Value on a Recurring Basis
Total	21,160	10,705
Level 2 | Municipal securities
Fair Value on a Recurring Basis
Total	2,999
Level 2 | Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	16,249	28,757
Level 2 | Commercial paper
Fair Value on a Recurring Basis
Total	77,440	112,409
Level 2 | Corporate notes
Fair Value on a Recurring Basis
Total	$ 73,598	97,866
Level 2 | Equity Investment
Fair Value on a Recurring Basis
Total		$ 361

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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