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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value on a Recurring Basis
Total	$ 254,454	$ 156,382
Money market funds
Fair Value on a Recurring Basis
Total	4,356	6,671
U.S. Treasury securities
Fair Value on a Recurring Basis
Total	10,705
Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	28,757	13,512
Commercial paper
Fair Value on a Recurring Basis
Total	112,409	44,130
Corporate notes
Fair Value on a Recurring Basis
Total	97,866	91,680
Equity Investment
Fair Value on a Recurring Basis
Total	361	389
Level 1
Fair Value on a Recurring Basis
Total	4,356	6,671
Level 1 | Money market funds
Fair Value on a Recurring Basis
Total	4,356	6,671
Level 2
Fair Value on a Recurring Basis
Total	250,098	149,711
Level 2 | U.S. Treasury securities
Fair Value on a Recurring Basis
Total	10,705
Level 2 | Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	28,757	13,512
Level 2 | Commercial paper
Fair Value on a Recurring Basis
Total	112,409	44,130
Level 2 | Corporate notes
Fair Value on a Recurring Basis
Total	97,866	91,680
Level 2 | Equity Investment
Fair Value on a Recurring Basis
Total	$ 361	$ 389

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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=117815213&loc=d3e19207-110258

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