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Significant Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 19 Months Ended
Oct. 17, 2014
Sep. 30, 2018
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Joint development agreement                
Research and development expense     $ 2,774   $ 3,519 $ 5,804 $ 7,517  
Common Stock                
Joint development agreement                
Number of shares sold       468,427        
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   $ 400 0 $ 1,200  
Collaborative Agreement | Silterra                
Joint development agreement                
Non-recurring engineering cost obligation   $ 1,000            
JCA costs     $ 0     $ 0   $ 600