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Significant Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 31 Months Ended
Oct. 17, 2014
Sep. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Joint development agreement          
Project costs     $ 2,439 $ 3,030  
Revenue     10,280 $ 10,108  
Common Stock          
Joint development agreement          
Number of shares sold       468,427  
Royalties          
Joint development agreement          
Revenue     966 $ 408  
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        
Project costs     0 $ 0  
Collaborative Agreement | Silterra          
Joint development agreement          
Non-recurring engineering cost obligation   $ 1,000      
JCA costs     $ 0   $ 600