XML 68 R77.htm IDEA: XBRL DOCUMENT v3.19.3
Lease Obligations - Schedule of Lease Assets and LIabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets and Liabilities, Lessee [Abstract]      
Operating lease assets $ 497    
Finance lease assets 9,550    
Total lease assets 10,047    
Operating lease liabilities current 276    
Finance lease liabilities current 5,089 $ 3,879 $ 3,007
Operating lease liabilities non-current 226    
Finance lease liabilities non-current 485 $ 3,367 $ 8,997
Total lease liabilities $ 6,076