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Supplemental balance sheet and cash flow information (available-for-sale debt securities) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Available-for-sale debt securities [Line Items]
Cost	$ 22,000
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	22,000
Cash and cash equivalents [Member] | Money market securities [Member] | Domestic [Member]
Available-for-sale debt securities [Line Items]
Cost	22,000
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	$ 22,000

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