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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, 2017
Dec. 31, 2016
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Minimum payments $ 83 $ 89
Less: amount representing finance charges (5) (6)
Present value of minimum lease payment 78 83
Within one year [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Minimum payments 39 32
Present value of minimum lease payment 36 29
After one year but not more than five years [Member]    
Disclosure Of Finance Lease And Operating Lease By Lessee [Line Items]    
Minimum payments 44 57
Present value of minimum lease payment $ 42 $ 54