Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Detail)

v3.19.3
Revenue Recognition - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 11,184
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 9,377
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 667
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 601
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 248
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 126
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Disaggregation of Revenue [Line Items]  
Revenue, Remaining Performance Obligation $ 165
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 1 month