Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disaggregated revenue	$ 3,090	$ 8,886
Product revenue
Disaggregated revenue	1,347	5,345
License and royalty revenue
Disaggregated revenue	1,718	99
Contract Revenue
Disaggregated revenue	25	3,442
Transferred at Point in Time
Disaggregated revenue	3,069	5,622
Transferred at Point in Time \| Product revenue
Disaggregated revenue	1,347	5,345
Transferred at Point in Time \| License and royalty revenue
Disaggregated revenue	1,718	99
Transferred at Point in Time \| Contract Revenue
Disaggregated revenue	4	178
Transferred over Time
Disaggregated revenue	21	3,264
Transferred over Time \| Product revenue
Disaggregated revenue	0	0
Transferred over Time \| License and royalty revenue
Disaggregated revenue	0	0
Transferred over Time \| Contract Revenue
Disaggregated revenue	$ 21	$ 3,264

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