INVESTMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Total debt securities available for sale	$ 102,849	$ 73,225
Total investment securities at fair value	140,983	110,935
Long-term investment securities at fair value	29,435	29,402
Marketable equity securities
Assets:
Total equity securities at fair value	14,103	14,286
Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	24,031	23,424
U.S. government securities
Assets:
Total debt securities available for sale	73,924
Corporate securities
Assets:
Total debt securities available for sale	6,516
U.S. government and federal agency
Assets:
Total debt securities available for sale	7,068
Recurring
Assets:
Total investment securities at fair value	140,983	110,935
Long-term investment securities at fair value	29,435	29,402
Total	542,431	407,139
Recurring | Total equity securities at fair value
Assets:
Total equity securities at fair value	38,134	37,710
Recurring | Marketable equity securities
Assets:
Total equity securities at fair value	14,103	14,286
Recurring | Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	24,031	23,424
Recurring | Total debt securities available for sale
Assets:
Total debt securities available for sale	102,849	73,225
Recurring | U.S. government securities
Assets:
Total debt securities available for sale	73,924	38,657
Recurring | Corporate securities
Assets:
Total debt securities available for sale	6,516	12,042
Recurring | U.S. government and federal agency
Assets:
Total debt securities available for sale	7,068	17,358
Recurring | Commercial paper
Assets:
Total debt securities available for sale	15,341	5,168
Recurring | Money market funds
Assets:
Cash and cash equivalents	328,308	214,515
Recurring | Commercial paper
Assets:
Cash and cash equivalents	43,705	52,287
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total investment securities at fair value	38,134	37,710
Long-term investment securities at fair value	0	0
Total	366,442	252,225
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities at fair value
Assets:
Total equity securities at fair value	38,134	37,710
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities
Assets:
Total equity securities at fair value	14,103	14,286
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	24,031	23,424
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available for sale
Assets:
Total debt securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government securities
Assets:
Total debt securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities
Assets:
Total debt securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency
Assets:
Total debt securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper
Assets:
Total debt securities available for sale	0	0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets:
Cash and cash equivalents	328,308	214,515
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Total investment securities at fair value	102,849	73,225
Long-term investment securities at fair value	0	0
Total	146,554	125,512
Recurring | Significant Other Observable Inputs (Level 2) | Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale
Assets:
Total debt securities available for sale	102,849	73,225
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government securities
Assets:
Total debt securities available for sale	73,924	38,657
Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets:
Total debt securities available for sale	6,516	12,042
Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and federal agency
Assets:
Total debt securities available for sale	7,068	17,358
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper
Assets:
Total debt securities available for sale	15,341	5,168
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper
Assets:
Cash and cash equivalents	43,705	52,287
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Total investment securities at fair value	0	0
Long-term investment securities at fair value	0	0
Total	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Total debt securities available for sale
Assets:
Total debt securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government securities
Assets:
Total debt securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities
Assets:
Total debt securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency
Assets:
Total debt securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper
Assets:
Total debt securities available for sale	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper
Assets:
Cash and cash equivalents	$ 0	$ 0