Leases - Summary of Maturity Analysis of Operating and Finance Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease payments due:
Within one year	$ 1,561
After one but within two years	1,868
After two but within three years	1,824
After three but within four years	1,572
After four but within five years	1,512
After five years	5,585
Total undiscounted cash flows	13,922
Discount on cash flows	(1,852)
Total lease liability	12,070	$ 12,544
Finance lease payments due:
Within one year	163
After one but within two years	216
After two but within three years	217
After three but within four years	217
After four but within five years	252
After five years	3,992
Total undiscounted cash flows	5,057
Discount on cash flows	(1,527)
Total lease liability	$ 3,530	$ 3,551