Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.19.1
Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 8 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 28, 2017
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%    
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 $ 43,700  
Strategic Alliance Agreement [Member]      
Related Party Transaction [Line Items]      
Revenue $ 7,100 $ 0  
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