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
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Sales revenue $ 73,584 $ 45,966
Business to Business | Domestic    
Disaggregation Of Revenue [Line Items]    
Sales revenue 28,016 17,461
Business to Business | International    
Disaggregation Of Revenue [Line Items]    
Sales revenue 16,906 11,423
Direct-to-Consumer | Domestic    
Disaggregation Of Revenue [Line Items]    
Sales revenue $ 28,662 $ 17,082