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FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - Recurring basis - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value on a Recurring Basis
Total	$ 131,390	$ 156,382
Money market funds
Fair Value on a Recurring Basis
Total	18,370	6,671
Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	11,520	13,512
Commercial paper
Fair Value on a Recurring Basis
Total	29,065	44,130
Corporate notes
Fair Value on a Recurring Basis
Total	72,266	91,680
Equity Investment
Fair Value on a Recurring Basis
Total	169	389
Level 1
Fair Value on a Recurring Basis
Total	18,370	6,671
Level 1 | Money market funds
Fair Value on a Recurring Basis
Total	18,370	6,671
Level 2
Fair Value on a Recurring Basis
Total	113,020	149,711
Level 2 | Government-sponsored enterprise securities
Fair Value on a Recurring Basis
Total	11,520	13,512
Level 2 | Commercial paper
Fair Value on a Recurring Basis
Total	29,065	44,130
Level 2 | Corporate notes
Fair Value on a Recurring Basis
Total	72,266	91,680
Level 2 | Equity Investment
Fair Value on a Recurring Basis
Total	$ 169	$ 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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