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Leases - Summary of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease Cost [Abstract]    
Operating Lease Cost $ 232 $ 695
Finance Lease Cost    
Amortization of right-of use assets 112 264
Interest on lease liabilities 10 23
Total Finance Lease Cost $ 122 $ 287