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Significant Agreements (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 21, 2016
Oct. 21, 2014
Oct. 17, 2014
Sep. 30, 2018
Feb. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Joint development agreement              
Research and development expense           $ 14,183 $ 23,637
Number of shares sold         3,772,447    
Non-cash compensation expense (income)             $ 753
Common Stock              
Joint development agreement              
Number of shares sold             3,772,447
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           1,800 $ 5,800
Milestone revenue             1,000
Joint Development Agreement | Global Foundries, Inc. | Common Stock              
Joint development agreement              
Number of shares sold   461,538          
Shares sold, price per share   $ 0.00026          
Number of shares of common stock, vested 211,538            
Joint Development Agreement | Global Foundries, Inc. | Research and development              
Joint development agreement              
Non-cash compensation expense (income)             800
Joint Development Agreement | Global Foundries, Inc. | Series B Redeemable Convertible Preferred Stock              
Joint development agreement              
Number of shares sold   192,307          
Shares sold, price per share   $ 26.00          
Collaborative Agreement | Silterra              
Joint development agreement              
Non-recurring engineering cost obligation       $ 1,000      
JCA costs           $ 200 $ 400