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Income Tax - Year of Expiration and Amount of Available Unused Net Operating Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses $ 16,762 $ 13,756
2018 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses   891
2019 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses 784 802
2020 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses 3,020 4,601
2021 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses 5,121 5,220
2022 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses 2,105 1,399
2023 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses 4,760  
No expiration [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unused net operating losses $ 972 $ 843