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Commitments and Contingencies - Future Minimum Payments under Finance Leases with Initial Terms of One Year or More (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]    
Minimum payments $ 94 $ 83
Less: amount representing finance charges (4) (5)
Present value of minimum lease payment 90 78
Within one year [Member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Minimum payments 47 39
Present value of minimum lease payment 44 36
After one year but not more than five years [Member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Minimum payments 47 44
Present value of minimum lease payment $ 46 $ 42