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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation Of Revenue [Line Items]        
Sales revenue $ 89,712 $ 63,137 $ 255,283 $ 167,141
Business to Business | Domestic        
Disaggregation Of Revenue [Line Items]        
Sales revenue 30,263 22,919 91,222 61,534
Business to Business | International        
Disaggregation Of Revenue [Line Items]        
Sales revenue 21,142 17,186 58,807 43,528
Direct-to-Consumer | Domestic        
Disaggregation Of Revenue [Line Items]        
Sales revenue $ 38,307 $ 23,032 $ 105,254 $ 62,079