Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment securities
Acquisition Cost	$ 79,670	$ 95,367
Accretion / (Amortization)	1,139	1,177
Unrealized Gain / (Loss)	(126)	(124)
Estimated Fair Value	80,683	96,420
Accrued interest receivable	451	586
Commercial paper
Investment securities
Acquisition Cost	24,942	15,681
Accretion / (Amortization)	739	285
Unrealized Gain / (Loss)	(27)	20
Estimated Fair Value	25,654	15,986
Corporate notes / bonds
Investment securities
Acquisition Cost	35,960	45,954
Accretion / (Amortization)	339	614
Unrealized Gain / (Loss)	(81)	(75)
Estimated Fair Value	36,218	46,493
Money market funds
Investment securities
Acquisition Cost	5,632	5,374
Estimated Fair Value	5,632	5,374
U.S. govt. agencies
Investment securities
Acquisition Cost	6,476	18,076
Accretion / (Amortization)	12	122
Unrealized Gain / (Loss)	(13)	(33)
Estimated Fair Value	6,475	18,165
U.S. treasuries
Investment securities
Acquisition Cost	6,660	10,282
Accretion / (Amortization)	49	156
Unrealized Gain / (Loss)	(5)	(36)
Estimated Fair Value	$ 6,704	$ 10,402

Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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