SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) segment customer	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Concentration Risk [Line Items]
Carrying value of money market funds	$ 223.0	$ 51.8
Carrying value of commercial paper	19.0	$ 6.5
Carrying value of asset-backed securities	$ 2.6
Number of reportable segments \| segment	1
Customer concentration
Concentration Risk [Line Items]
Concentration risk, number of customers \| customer	3
Sales Revenue, Net \| Customers outside U.S. \| Customer concentration
Concentration Risk [Line Items]
Concentration risk (as a percent)	1.00%	0.00%	0.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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