Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Sales Revenue Disaggregated by Sales Channel and Geographic Region (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Sales Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Sales revenue $ 91,987 $ 58,038 $ 165,571 $ 104,004
Business to Business | Domestic        
Disaggregation Of Revenue [Line Items]        
Sales revenue 32,943 21,154 60,959 38,615
Business to Business | International        
Disaggregation Of Revenue [Line Items]        
Sales revenue 20,759 14,919 37,665 26,342
Direct-to-Consumer | Domestic        
Disaggregation Of Revenue [Line Items]        
Sales revenue $ 38,285 $ 21,965 $ 66,947 $ 39,047