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Summary Of Significant Accounting Policies - Summary of lease liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Operating lease commitments disclosed as at December 31, 2018   $ 5,064
Less: short-term leases recognized on a straight-line basis as expense $ (1,287) (210)
Operating lease commitments net of short term lease cost   4,854
Discounted using the lessee's incremental borrowing rate of 6.25% at the date of initial application 3,565 4,269
Add: additional leases identified on adoption of Topic 842   88
Add: finance lease liabilities recognized as at December 31, 2018 $ 95 180
Lease liability recognized as at January 1, 2019   4,537
Current lease liabilities   871
Non-current lease liabilities   3,666
Total lease liabilities   $ 4,537