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7. Leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 675 $ 655
Cash paid for amounts included in the measurement of lease liabilities 659 650
Operating cash flows from operating leases 0 0
Right-of-use assets obtained in exchange for new lease liabilities - operating leases $ 450 $ 0
Weighted-average remaining lease term - operating leases 7 years 4 months 10 days 7 years 6 months 4 days
Weighted-average discount rate - operating leases 2.97% 3.18%