Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.8.0.1
Related Party Transactions - Additional Information (Detail) - Dialog Semiconductor Plc [Member] - USD ($)
3 Months Ended 8 Months Ended
Mar. 31, 2018
Jun. 28, 2017
Related Party Transaction [Line Items]    
Equity method investment, ownership percentage 7.00%  
Percentage of common shares potentially own outstanding shares 12.00%  
Research and Development Expense [Member]    
Related Party Transaction [Line Items]    
Payments for fees $ 43,700  
Private Placements [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]    
Related Party Transaction [Line Items]    
Class of warrant or right, number of securities called by warrants or rights   1,417,565