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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures Abstract |
Fair Value of Cash Equivalents and Marketable Securities | The fair value hierarchy of the Company’s cash equivalents and marketable securities at December 31, 2022 and 2021, was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurement at
​ | ​ | December 31, 2022
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Active Markets for | ​ | Significant Other
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Observable Inputs
(In thousands) | ​ | Total Fair Value | ​ | (Level 1) | ​ | (Level 2)
Commercial paper | ​ | $ | 58,683 | ​ | $ | — | ​ | $ | 58,683
Corporate securities | ​ | ​ | 248,441 | ​ | ​ | — | ​ | ​ | 248,441
Money market funds | ​ |  | 363 | ​ |  | 363 | ​ |  | —
Total | ​ | $ | 307,487 | ​ | $ | 363 | ​ | $ | 307,124
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurement at
​ | ​ | December 31, 2021
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Active Markets for | ​ | Significant Other
​ | ​ | ​ | ​ | ​ | Identical Assets | ​ | Observable Inputs
(In thousands) | ​ | Total Fair Value | ​ | (Level 1) | ​ | (Level 2)
Commercial paper | ​ | $ | 172,237 | ​ | $ | — | ​ | $ | 172,237
Corporate securities | ​ | ​ | 282,540 | ​ | ​ | — | ​ | ​ | 282,540
Money market funds | ​ |  | 29,793 | ​ |  | 29,793 | ​ |  | —
Total | ​ | $ | 484,570 | ​ | $ | 29,793 | ​ | $ | 454,777
​

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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