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Joint Development Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended
Aug. 21, 2016
Oct. 21, 2014
Oct. 17, 2014
Jun. 30, 2018
Feb. 28, 2018
Aug. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Joint development agreement                        
Research and development expense             $ 6,773,000 $ 6,427,000 $ 13,253,000 $ 12,816,000    
Number of shares sold         3,772,447              
Non-cash compensation expense (income)                 462,000 716,000    
Joint Development Agreement | Global Foundries                        
Joint development agreement                        
Agreement Term     4 years                  
Period to Repurchase Shares   1 year                    
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             2,300,000 1,400,000 4,400,000 3,200,000    
Milestone payment due per the agreement       $ 1,000,000   $ 1,600,000            
Milestone revenue             $ 500,000 650,000 $ 500,000 1,200,000    
Joint Development Agreement | Global Foundries | 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                   211,538  
Number of shares of common stock, unvested       38,462     38,462   38,462      
Estimated fair value of common stock per share       $ 8.92     $ 8.92   $ 8.92     $ 7.50
Joint Development Agreement | Global Foundries | Research and Development                        
Joint development agreement                        
Non-cash compensation expense (income)             $ 225,000 $ 461,000 $ 462,000 $ 716,000    
Joint Development Agreement | Global Foundries | Series B Redeemable Convertible Preferred Stock                        
Joint development agreement                        
Number of shares sold   192,307                    
Shares sold, price per share   $ 26.00