Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disaggregated revenue	$ 479	$ 1,469
Product revenue
Disaggregated revenue	0	1,247
License and royalty revenue
Disaggregated revenue	479	212
Contract Revenue
Disaggregated revenue	0	10
Transferred at Point in Time
Disaggregated revenue	479	1,463
Transferred at Point in Time \| Product revenue
Disaggregated revenue	0	1,247
Transferred at Point in Time \| Royalty revenue
Disaggregated revenue	479	212
Transferred at Point in Time \| Contract Revenue
Disaggregated revenue	0	4
Transferred over Time
Disaggregated revenue	0	6
Transferred over Time \| Product revenue
Disaggregated revenue	0	0
Transferred over Time \| Royalty revenue
Disaggregated revenue	0	0
Transferred over Time \| Contract Revenue
Disaggregated revenue	$ 0	$ 6

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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+ Details