Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Estimated Remaining Performance Obligations - Additional Information (Details)

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Summary of Significant Accounting Policies - Estimated Remaining Performance Obligations - Additional Information (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 9,000,000
Estimated remaining performance obligations for contractually committed revenues recognition period Remainder of the year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 27,000,000
Estimated remaining performance obligations for contractually committed revenues recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 20,800,000
Estimated remaining performance obligations for contractually committed revenues recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 14,200,000
Estimated remaining performance obligations for contractually committed revenues recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 600,000
Estimated remaining performance obligations for contractually committed revenues recognition period 3 years