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Commitments and Contingencies - Schedule of Contractual Obligations, Commitments and Contingencies (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Long-Term Debt [Member]  
Commitment And Contingencies [Line Items]  
Payments due in 1 year $ 319
Payments due in 2 years 341
Payments due in 3 years 365
Payments due in 4 years 389
Payments due in 5+ years 1,845
Contractual obligations, commitments and contingencies 3,259
Operating Leases [Member]  
Commitment And Contingencies [Line Items]  
Payments due in 1 year 491
Payments due in 2 years 295
Payments due in 3 years 87
Payments due in 4 years 7
Payments due in 5+ years 0
Contractual obligations, commitments and contingencies 880
Interest on Outstanding Debt [Member]  
Commitment And Contingencies [Line Items]  
Payments due in 1 year 206
Payments due in 2 years 184
Payments due in 3 years 161
Payments due in 4 years 136
Payments due in 5+ years 278
Contractual obligations, commitments and contingencies $ 965