Significant Risk Concentrations (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019		2018
Reductions to cost of revenue	$	82	$	260
Reductions to marketing expense	$	413	$	267