Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.10.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
8 Months Ended 9 Months Ended
Jun. 28, 2017
Sep. 30, 2018
Dialog Semiconductor Plc [Member]    
Related Party Transaction [Line Items]    
Equity method investment, ownership percentage   6.80%
Percentage of common shares potentially own outstanding shares   11.70%
Dialog Semiconductor Plc [Member] | Research and Development Expense [Member]    
Related Party Transaction [Line Items]    
Payments for fees   $ 43,700
Strategic Alliance Agreement [Member]    
Related Party Transaction [Line Items]    
Revenue   $ 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