Quarterly report pursuant to Section 13 or 15(d)

Revenue - Narrative (Details)

v3.19.3
Revenue - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Unbilled receivables, net $ 54,151   $ 54,151   $ 41,255
Contract with customer, liability 4,900   4,900   $ 5,000
Contract with customer, liability, revenue recognized     2,100 $ 8,100  
Revenue, remaining performance obligation $ 252,000   $ 252,000    
Sales Revenue, Net | Product Concentration Risk | Transferred over Time          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Concentration risk, percentage 57.00% 57.00% 57.00% 57.00%  
Sales Revenue, Net | Product Concentration Risk | Transferred at Point in Time          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Concentration risk, percentage 43.00% 43.00% 43.00% 43.00%