Revenue - Disaggregated by Type (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue
Revenue	$ 42,031	$ 37,503
Product sales
Disaggregation of Revenue
Revenue	39,848	34,595
Royalties
Disaggregation of Revenue
Revenue	998	1,070
Other revenue
Disaggregation of Revenue
Revenue	$ 1,185	$ 1,838

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