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Nexperia Arrangement (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Apr. 04, 2018
Mar. 26, 2018
Jun. 30, 2020
Dec. 31, 2019
Oct. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
License fees $ 9,000,000   $ 5,000,000   $ 3,000,000 $ 3,000,000   $ 3,000,000   $ 9,000,000.0    
Series 3 Preferred Stock                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Issuance of preferred stock 16,000,000 $ 16,000,000                    
Tranche A Loan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Long-term loan facility 5,000,000.0                      
Reduction of debt     $ 5,000,000                  
Proceeds from Issuance of debt             $ 5,000,000          
Tranche B Loan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Long-term loan facility 10,000,000                     $ 8,000,000.0
Proceeds from Issuance of debt                 $ 8,000,000      
Tranche B-1 Loan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Long-term loan facility                       $ 2,000,000.0
Proceeds from Issuance of debt       $ 2,000,000                
Tranche C Loan                        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                        
Revolving loan $ 10,000,000                      
Proceeds from Issuance of debt                     $ 10,000,000