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Significant Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 28 Months Ended
Oct. 17, 2014
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Joint development agreement          
Research and development expense     $ 10,896 $ 14,183  
Revenue     $ 42,031 $ 37,503  
Common Stock          
Joint development agreement          
Number of shares sold     468,427 888,987  
Royalties          
Joint development agreement          
Revenue     $ 998 $ 1,070  
Joint Development Agreement | Global Foundries, Inc.          
Joint development agreement          
Period of possession of exclusive right to manufacture after qualification of device 3 years        
Period of possession of exclusive right to manufacture after completion of device development work 4 years        
Research and development expense     0 1,800  
Collaborative Agreement | Silterra          
Joint development agreement          
Non-recurring engineering cost obligation   $ 1,000      
JCA costs was paid     $ 0 $ 200 $ 600