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Leases - Schedule of Lease costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Amortization of leased assets $ 1,171 $ 1,171
Interest on lease liabilities 497 644
Net lease cost 2,085 2,210
Cost of sales    
Lessee, Lease, Description [Line Items]    
Operating lease cost 164 155
Selling, general and administrative expenses    
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 253 $ 240