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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Marketable Securities, Available For Sale |  |
Cash and cash equivalents | $ 31,807 | $ 21,993
Fair Value, Recurring |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 309,917 | 353,202
Unrealized Gain, Marketable securities, available for sale | 6 | 21
Unrealized Losses, Marketable securities, available for sale | (553) | (1,376)
Fair Market Value, Marketable securities, available for sale | 309,370 | 351,847
Fair Value, Recurring | Level 1 | Money market funds |  |
Marketable Securities, Available For Sale |  |
Cash and cash equivalents | 31,249 | 21,893
Cash equivalents, Fair Market Value | 31,249 | 21,893
Fair Value, Recurring | Level 2 | Commercial paper |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 90,049 | 144,730
Fair Market Value, Marketable securities, available for sale | 90,049 | 144,730
Fair Value, Recurring | Level 2 | Asset-backed securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 17,063 | 23,020
Unrealized Gain, Marketable securities, available for sale |  | 8
Unrealized Losses, Marketable securities, available for sale | (34) | (44)
Fair Market Value, Marketable securities, available for sale | 17,029 | 22,984
Fair Value, Recurring | Level 2 | Corporate debt securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 47,909 | 54,374
Unrealized Gain, Marketable securities, available for sale | 6 |
Unrealized Losses, Marketable securities, available for sale | (308) | (510)
Fair Market Value, Marketable securities, available for sale | 47,607 | 53,864
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 | 113,524 | 54,672
Unrealized Losses, Marketable securities, available for sale | (209) | (624)
Fair Market Value, Marketable securities, available for sale | 113,315 | 54,048
Fair Value, Recurring | Level 2 | Supranational and sovereign government securities |  |
Marketable Securities, Available For Sale |  |
Amortized Cost Basis, Marketable securities, available for sale | 10,123 | 54,513
Unrealized Gain, Marketable securities, available for sale |  | 13
Unrealized Losses, Marketable securities, available for sale | (2) | (198)
Fair Market Value, Marketable securities, available for sale | $ 10,121 | $ 54,328

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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