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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Marketable Securities, Available For Sale |  |
Cash and cash equivalents | $ 109,747 | $ 15,566
Fair Value, Recurring |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 366,901 | 281,203
Unrealized Gain, Marketable securities, available for sale | 10 |
Unrealized Losses, Marketable securities, available for sale | (2,189) | (514)
Fair Market Value, Marketable securities, available for sale | 364,722 | 280,689
Fair Value, Recurring | Level 1 | Money market funds |  |
Marketable Securities, Available For Sale |  |
Cash and cash equivalents | 109,647 | 15,466
Cash equivalents, Fair Market Value | 109,647 | 15,466
Fair Value, Recurring | Level 2 | Commercial paper |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 79,191 | 58,970
Fair Market Value, Marketable securities, available for sale | 79,191 | 58,970
Fair Value, Recurring | Level 2 | Asset-backed securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 12,778 | 36,681
Unrealized Losses, Marketable securities, available for sale | (65) | (42)
Fair Market Value, Marketable securities, available for sale | 12,713 | 36,639
Fair Value, Recurring | Level 2 | Corporate debt securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 66,233 | 88,084
Unrealized Losses, Marketable securities, available for sale | (898) | (160)
Fair Market Value, Marketable securities, available for sale | 65,335 | 87,924
Fair Value, Recurring | Level 2 | U.S. government treasury and agency securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 54,228 | 59,596
Unrealized Losses, Marketable securities, available for sale | (933) | (222)
Fair Market Value, Marketable securities, available for sale | 53,295 | 59,374
Fair Value, Recurring | Level 2 | Supranational and sovereign government securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 44,824 | 22,406
Unrealized Gain, Marketable securities, available for sale | 10 |
Unrealized Losses, Marketable securities, available for sale | (293) | (90)
Fair Market Value, Marketable securities, available for sale | $ 44,541 | $ 22,316

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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