Annual report pursuant to Section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Sales Revenue Disaggregated by Sales Channel and Geographic Region (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation Of Revenue [Line Items]      
Total sales revenue $ 336,015 $ 225,492 $ 168,170
Business to Business | Domestic      
Disaggregation Of Revenue [Line Items]      
Total sales revenue 116,581 83,390 56,605
Business to Business | International      
Disaggregation Of Revenue [Line Items]      
Total sales revenue 77,333 55,519 50,106
Direct-to-Consumer | Domestic      
Disaggregation Of Revenue [Line Items]      
Total sales revenue $ 142,101 $ 86,583 $ 61,459