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Summary of significant accounting policies (Tables)
6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Disaggregation of Revenue
The following table provides disaggregated revenue from contracts with customers by geographical market, as the nature, amount, timing and uncertainty of revenue and cash flows can differ between domestic and international customers.
 
Three months ended June 30,
 
Six months ended June 30,
Net sales by geographic region:
2018
 
2017
 
2018
 
2017
United States
$
53,038

 
$
49,906

 
$
115,145

 
$
106,329

International
6,017

 
5,950

 
9,830

 
10,101

Total net sales
$
59,055

 
$
55,856

 
$
124,975

 
$
116,430