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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregated revenue | $ 8,886 | $ 17,607
Product revenue |  |
Disaggregated revenue | 5,345 | 0
License and royalty revenue |  |
Disaggregated revenue | 99 | 10,011
Contract Revenue |  |
Disaggregated revenue | 3,442 | 7,596
Transferred at Point in Time |  |
Disaggregated revenue | 5,622 | 10,200
Transferred at Point in Time | Product revenue |  |
Disaggregated revenue | 5,345 | 0
Transferred at Point in Time | License and royalty revenue |  |
Disaggregated revenue | 99 | 10,011
Transferred at Point in Time | Contract Revenue |  |
Disaggregated revenue | 178 | 189
Transferred over Time |  |
Disaggregated revenue | 3,264 | 7,407
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 | $ 3,264 | $ 7,407

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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