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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of financial assets measured at fair value on a recurring basis by level within the fair value hierarchy | The following tables summarize the Company’s financial assets measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, 2022
​ | ​ | Fair Value | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair Market
​ |  | Hierarchy |  | Cost Basis |  | Gains |  | Losses |  | Value
Cash equivalents: |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market funds |  | Level 1 | ​ | $ | 109,647 | ​ | $ | — | ​ | $ | — | ​ | $ | 109,647
Marketable securities, available for sale: |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Asset-backed securities |  | Level 2 | ​ |  | 12,778 | ​ |  | — | ​ |  | (65) | ​ |  | 12,713
Corporate debt securities |  | Level 2 | ​ |  | 66,233 | ​ |  | — | ​ |  | (898) | ​ |  | 65,335
Commercial paper |  | Level 2 | ​ |  | 79,191 | ​ |  | — | ​ |  | — | ​ |  | 79,191
U.S. government treasury and agency securities | ​ | Level 2 | ​ |  | 54,228 | ​ |  | — | ​ |  | (933) | ​ |  | 53,295
Supranational and sovereign government securities | ​ | Level 2 | ​ |  | 44,824 | ​ |  | 10 | ​ |  | (293) | ​ |  | 44,541
Total financial assets |  |  | ​ | $ | 366,901 | ​ | $ | 10 | ​ | $ | (2,189) | ​ | $ | 364,722
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2021
​ | ​ | Fair Value | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair Market
​ | ​ | Hierarchy |  | Cost Basis |  | Gains |  | Losses |  | Value
Cash equivalents: |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market funds |  | Level 1 | ​ | $ | 15,466 | ​ | $ | — | ​ | $ | — | ​ | $ | 15,466
Marketable securities, available for sale: |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Asset-backed securities |  | Level 2 | ​ |  | 36,681 | ​ |  | — | ​ |  | (42) | ​ |  | 36,639
Corporate debt securities |  | Level 2 | ​ |  | 88,084 | ​ |  | — | ​ |  | (160) | ​ |  | 87,924
Commercial paper | ​ | Level 2 | ​ | ​ | 58,970 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 58,970
U.S. government treasury and agency securities | ​ | Level 2 | ​ | ​ | 59,596 | ​ | ​ | — | ​ | ​ | (222) | ​ | ​ | 59,374
Supranational and sovereign government securities |  | Level 2 | ​ |  | 22,406 | ​ |  | — | ​ |  | (90) | ​ |  | 22,316
Total financial assets |  |  | ​ | $ | 281,203 | ​ | $ | — | ​ | $ | (514) | ​ | $ | 280,689

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