Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.19.2
Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 8 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 28, 2017
Mar. 31, 2019
Related Party Transaction [Line Items]            
Class of warrant or right, number of securities called by warrants or rights           1,666,666
Dialog Semiconductor Plc [Member]            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage 5.70%   5.70%      
Percentage of common shares potentially own outstanding shares     9.90%      
Dialog Semiconductor Plc [Member] | Research and Development Expense [Member]            
Related Party Transaction [Line Items]            
Payments for fees $ 0 $ 0 $ 0 $ 43,700    
Strategic Alliance Agreement [Member]            
Related Party Transaction [Line Items]            
Revenue $ 0 $ 5,773 $ 7,100 $ 5,773    
Private Placements [Member] | Dialog Semiconductor Plc [Member]            
Related Party Transaction [Line Items]            
Stock issued during period, shares, new issues         1,739,691  
Private Placements [Member] | Warrant Issued to Private Investors [Member] | Dialog Semiconductor Plc [Member]            
Related Party Transaction [Line Items]            
Class of warrant or right, number of securities called by warrants or rights         1,417,565