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Revenue - Performance Obligations (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Revenue |
Future revenue related to current unsatisfied performance obligations | $ 22,997
Revenue, Practical Expedient, Remaining Performance Obligation [true/false] | true
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true/false] | true
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01 |
Revenue |
Future revenue related to current unsatisfied performance obligations | $ 5,330
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
Revenue |
Future revenue related to current unsatisfied performance obligations | $ 7,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |
Revenue |
Future revenue related to current unsatisfied performance obligations | $ 4,466
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |
Revenue |
Future revenue related to current unsatisfied performance obligations | $ 6,101
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months

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