Quarterly report pursuant to Section 13 or 15(d)

Leases - Components of Lease Expense (Detail)

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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease expense $ 597 $ 1,595
Variable lease expense 124 356
Total operating lease expense 721 1,951
Amortization of right-of-use asset 2 6
Interest on lease liabilities 1 3
Total finance lease expense 3 9
Sublease rental income $ (27) $ (110)