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STOCK-BASED COMPENSATION - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	$ 9,744	$ 6,594	$ 4,246
Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	9,409	6,594	4,133
Restricted stock awards relating to founder shares
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	0	0	113
2021 ESPP
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	128	0	0
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	$ 207	$ 0	$ 0

X

- Definition

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
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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