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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Summary of Intangible Assets    
Intangible assets, Cost $ 898  
Finite lived intangible assets, Accumulated Amortization 440  
Intangible assets, Net Value 458 $ 527
License    
Summary of Intangible Assets    
Indefinite lived intangible assets, Net Value $ 218  
Intellectual property    
Summary of Intangible Assets    
Finite lived intangible assets, Useful Lives 3 years  
Finite lived intangible assets, Cost $ 322  
Finite lived intangible assets, Accumulated Amortization $ 322  
License    
Summary of Intangible Assets    
Finite lived intangible assets, Useful Lives 5 years  
Finite lived intangible assets, Cost $ 358  
Finite lived intangible assets, Accumulated Amortization 118  
Finite lived intangible assets, Net Value $ 240