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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	$ 1,973	$ 1,707	$ 3,767	$ 3,275
Research and development
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	906	579	1,731	1,080
General and administrative
Stock-Based Compensation Expense
Stock-based compensation expense included in operating expenses	$ 1,067	$ 1,128	$ 2,036	$ 2,195

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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