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