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Lease Commitments - Summary of Impact of The Adoption On Our Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets      
Operating lease assets $ 2,131 $ 907  
Liabilities      
Lease payable - current portion 656    
Lease payable, long-term portion 1,548   $ 38
Balances Without Adoption Of Topic 842 [Member]      
Assets      
Operating lease assets    
Liabilities      
Lease payable - current portion 15    
Lease payable, long-term portion 8    
Accounting Standards Update 2016-02 [Member]      
Assets      
Operating lease assets 2,131 $ 907  
Liabilities      
Lease payable - current portion 641    
Lease payable, long-term portion $ 1,540