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Revenue from Contracts with Customers (Summary of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation Of Revenue [Line Items]
Revenue	$ 25,691	$ 23,509	$ 49,757	$ 51,514
Clinical product revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	334	267	334	267
Other services [Member]
Disaggregation Of Revenue [Line Items]
Revenue	526	660	1,036	898
Non-cash royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	24,831	22,582	48,387	50,349
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue	25,165	22,849	48,721	50,616
United States [Member] | Clinical product revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	334	267	334	267
United States [Member] | Non-cash royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	24,831	22,582	48,387	50,349
Rest of World [Member]
Disaggregation Of Revenue [Line Items]
Revenue	526	660	1,036	898
Rest of World [Member] | Other services [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 526	$ 660	$ 1,036	$ 898

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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