Annual report pursuant to Section 13 and 15(d)

Revenue Disclosures - Revenue Related to Performance Obligations - Maturity (Details)

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Revenue Disclosures - Revenue Related to Performance Obligations - Maturity (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 15,107
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 2,741
Contract liabilities expected to be recognized, year 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 2,626
Contract liabilities expected to be recognized, year 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 2,240
Contract liabilities expected to be recognized, year 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 1,907
Contract liabilities expected to be recognized, year 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 1,477
Contract liabilities expected to be recognized, year 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Disaggregation of Revenue [Line Items]  
Contract liabilities expected to be recognized $ 4,116
Contract liabilities expected to be recognized, year