Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cash and cash equivalents
Money market funds	$ 7,133	$ 3,563
Cash deposits	2	2
Total cash and cash equivalents	7,135	3,565
Short-term investments
Bonds (held-to-maturity)	2,618	2,552
Equity securities (available for sale)	142	139
Total short-term investments	2,760	2,691
Long-term investments
Equity securities (available for sale)	4,227	4,354
Bonds (held-to-maturity)	3,307	3,575
Mutual funds (available for sale)	1,319	236
Total long-term investments	8,853	8,165
Total cash, cash equivalents and short and long-term investments	$ 18,748	$ 14,421

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