Revenue - Disaggregated by Type (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue
Revenue	$ 10,280	$ 10,108
Product sales
Disaggregation of Revenue
Revenue	9,068	9,635
Royalties
Disaggregation of Revenue
Revenue	966	408
Other revenue
Disaggregation of Revenue
Revenue	$ 246	$ 65

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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+ Details