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Leases -The Company's operating and finance leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Finance lease costs:        
Amortization – ROU assets [1] $ 4 $ 4 $ 13 $ 10
Interest expense 1 1 2 2
Operating lease costs [1] 404 90 560 244
Short-term lease costs [1] 44 37 135 141
Total lease costs $ 453 $ 132 710 397
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows – finance leases     1 2
Operating cash flows – operating leases     566 239
Financing cash flows – finance leases     $ 13 $ 9
Weighted-average remaining lease term:        
Finance leases (in years) 2 years 9 months 18 days   2 years 9 months 18 days  
Operating leases (in years) 2 years 10 months 24 days   2 years 10 months 24 days  
Weighted-average discount rate:        
Finance leases 3.70%   3.70%  
Operating leases 2.90%   2.90%  
[1] Included in other operating expenses of the consolidated statement of income.