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Financed Lease Receivables - Future Minimum Lease Payments under Non-Cancelable Sales-Type Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Future minimum lease payments under non-cancelable sales-type leases    
2017 $ 2,162  
2018 605  
2019 192  
2020 192  
2021 101  
Total minimum future lease payments $ 3,252 $ 2,745