Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Detail)

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Basis of Presentation and Significant Accounting Policies - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 13,901
2019 [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 12,348
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 year
2020 [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 719
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 year
2021 [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 354
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 year
2022 [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 177
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 year
2023 [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 101
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 year
Thereafter [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 202