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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, 2018
Dec. 31, 2017
Joint development agreement              
Research and development expense           $ 23,637 $ 25,437
Number of shares sold         3,772,447    
Non-cash compensation expense (income)           $ 753 1,472
Common Stock [Member]              
Joint development agreement              
Number of shares sold           3,772,447  
Joint Development Agreement [Member] | Global Foundries, Inc. [Member]              
Joint development agreement              
Agreement Term     4 years        
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           $ 5,800 5,200
Milestone revenue           1,000 1,600
Joint Development Agreement [Member] | Global Foundries, Inc. [Member] | Common Stock [Member]              
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 [Member] | Global Foundries, Inc. [Member] | Research and Development [Member]              
Joint development agreement              
Non-cash compensation expense (income)           800 $ 1,500
Joint Development Agreement [Member] | Global Foundries, Inc. [Member] | Series B Redeemable Convertible Preferred Stock [Member]              
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           $ 800