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Concentration of Risk, Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2022
Concentration of Risk, Segment and Geographic Information |
Revenue by Geographical Region | Revenue attributed to the following geographic regions was as follows (in thousands) based on the location of the licensees: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2022 |  | 2021
United States | ​ | $ | 4,477 | ​ | $ | 2,610
Asia Pacific | ​ |  | 1,550 | ​ |  | 550
Europe | ​ | ​ | — | ​ | ​ | 35,000
Total | ​ | $ | 6,027 | ​ | $ | 38,160
​

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- Definition Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 + Details
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