Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregated revenue	$ 1,469	$ 1,851
Product revenue
Disaggregated revenue	1,247	199
License and royalty revenue
Disaggregated revenue	212	0
Contract Revenue
Disaggregated revenue	10	1,652
Transferred at Point in Time
Disaggregated revenue	1,463	215
Transferred at Point in Time \| Product revenue
Disaggregated revenue	1,247	199
Transferred at Point in Time \| Royalty revenue
Disaggregated revenue	212	0
Transferred at Point in Time \| Contract Revenue
Disaggregated revenue	4	16
Transferred over Time
Disaggregated revenue	6	1,636
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	$ 6	$ 1,636

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
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details