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Leases - Schedule of components of lease expense (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 3,612 [1]
Finance lease cost:  
Amortization of right-of-use assets 309
Interest on lease liability (360)
Total finance lease cost 669
Total lease cost $ 4,281
[1] includes variable lease costs which are immaterial