Quarterly report pursuant to Section 13 or 15(d)

Revenue Narrative (Details)

v3.10.0.1
Revenue Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Contract assets, current $ 156 $ 156 $ 550 $ 0
Contract with customer, liability 10,600 10,600 $ 8,600  
Contract with customer, revenue recognized 3,800 7,300    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations 11,000 11,000    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Remaining performance obligations $ 17,300 $ 17,300