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Lease Commitments - Schedule of Components of Lease Expense (Detail) - Accounting Standards Update 2016-02 [Member]
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 208 $ 626
Finance lease costs    
Amortization of leased assets 4 11
Interest on lease liabilities Interest expense 1 2
Total 213 639
Cash paid for operating cash flows from operating leases 208 626
Cash paid for operating cash flows from finance leases 1 2
Cash paid for financing cash flows from finance leases $ 4 $ 11
Weighted-average remaining lease term of operating leases (in years) 3 years 4 months 20 days 3 years 4 months 20 days
Weighted-average remaining lease term of finance leases (in years) 1 year 1 year
Weighted-average discount rate for operating leases 5.30% 5.30%
Weighted-average discount rate for finance leases 11.00% 11.00%