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FAIR VALUE MEASUREMENT (Tables) | 6 Months Ended
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Jun. 30, 2024
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Our assets measured at fair value on a recurring basis consisted of the following:
| June 30, 2024
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 26,400 |  | $ | 26,400 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 30,457 |  | 30,457 |  | — |  | — |
Cash, cash equivalents and restricted cash and cash equivalents (1) | $ | 56,857 |  | $ | 56,857 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 28,834 |  | $ | — |  | $ | 28,834 |  | $ | — |
Corporate debt securities | 69,537 |  | — |  | 69,537 |  | — |
Agency mortgage-backed securities | 11,843 |  | — |  | 11,843 |  | — |
U.S. government and agency securities | 957 |  | — |  | 957 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 111,171 |  | $ | — |  | $ | 111,171 |  | $ | — |
| December 31, 2023
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 61,885 |  | $ | 61,885 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 37,421 |  | 37,421 |  | — |  | — |
Cash, cash equivalents and restricted cash and cash equivalents (1) | $ | 99,306 |  | $ | 99,306 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 31,804 |  | $ | — |  | $ | 31,804 |  | $ | — |
Corporate debt securities | 74,912 |  | — |  | 74,912 |  | — |
Agency mortgage-backed securities | 13,235 |  | — |  | 13,235 |  | — |
U.S. government and agency securities | 962 |  | — |  | 962 |  | — |
Restricted investments classified as held-to-maturity (2) | $ | 120,913 |  | $ | — |  | $ | 120,913 |  | $ | — |
(1)Cash, cash equivalents and restricted cash and cash equivalents include money market funds and deposits. (2)Refer to Note 4: Restricted Cash, Cash Equivalents and Investments for additional details on our held-to-maturity debt securities.

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