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Significant Risk Concentrations (Tables)
 9 Months Ended
Sep. 30, 2018
Risks And Uncertainties [Abstract]  
Summary of Rebate Program Recorded Under Rebate Credits

Under this rebate program, we recorded rebate credits as follows (in thousands):

 

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Reductions to cost of revenue

 

 

$

159

 

 

$

126

 

 

$

577

 

 

$

323

 

Reductions to marketing expense

 

 

$

294

 

 

$

185

 

 

$

673

 

 

$

558