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Lease Obligations - Schedule of Lease Costs and Terms for Operating and Finance Lease Obligations (Detail)
Jun. 30, 2019
Leases [Abstract]  
Operating leases, weighted-average remaining lease term (years) 1 year 6 months
Finance leases, weighted-average remaining lease term (years) 1 year
Operating leases, weighted-average discount rate 7.30%
Finance leases, weighted-average discount rate Weighted-average discount rate 9.90%