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Revenue from Contracts with Customers (Summary of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Revenue	$ 30,235	$ 25,112	$ 79,992	$ 76,626
Clinical product revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	1,087		1,421	267
Other services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		454	1,036	1,353
Non-cash royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	29,148	24,658	77,535	75,006
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue	30,235	24,658	78,956	75,273
United States [Member] | Clinical product revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue	1,087		1,421	267
United States [Member] | Non-cash royalties [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 29,148	24,658	77,535	75,006
Rest of World [Member]
Disaggregation Of Revenue [Line Items]
Revenue		454	1,036	1,353
Rest of World [Member] | Other services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		$ 454	$ 1,036	$ 1,353

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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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