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Summary of significant accounting policies (Tables)
12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of Concentrations of Risk
During the years ended December 31, 2018, 2017 and 2016, two customers individually accounted for greater than 10% of the Company’s net sales as disclosed below:
 
Year ended December 31,
 
2018
 
2017
 
2016
Customer A
21
%
 
25
%
 
28
%
Customer B
30
%
 
29
%
 
30
%
Customers that individually accounted for greater than 10% of the Company’s accounts receivable at the end of the periods are as presented:
 
December 31, 2018
 
December 31, 2017
Customer A
27
%
 
29
%
Customer B
20
%
 
17
%
Customer C
*

 
17
%
Schedule of Useful Lives by Major Asset Class
Useful lives by major asset class are as follows:
 
 
Estimated
useful lives
Machinery, equipment and software
 
3-5 years
Leasehold improvements
 
5 years
Furniture and fixtures
 
2-5 years
Store fixtures
 
2-3 years
Net Sales in United States and Outside of United States
During the years ended December 31, 2018, 2017 and 2016, net sales in the United States and outside of the United States were as follows (in thousands):
 
Year ended December 31,
 
2018
 
2017
 
2016
U.S.
$
240,612

 
$
243,299

 
$
210,236

International
26,823

 
26,589

 
19,331

Total net sales
$
267,435

 
$
269,888

 
$
229,567

Property and Equipment in United States and Outside of United States
As of December 31, 2018 and 2017, the Company had property and equipment in the United States and outside of the United States as follows (in thousands):
 
December 31, 2018
 
December 31, 2017
U.S.
$
21,236

 
$
17,834

International
568

 
203

Total property and equipment, net
$
21,804

 
$
18,037

Reconciliation of Sales Allowances
A reconciliation of the beginning and ending amounts of the reserve for sales adjustments for the years ended December 31, 2018, 2017 and 2016 is as follows (in thousands):
Balance as of December 31, 2015
$
3,866

Charges
24,427

Deductions
(16,366
)
Balance as of December 31, 2016
11,927

Charges
25,680

Deductions
(29,149
)
Balance as of December 31, 2017
8,458

Charges
26,971

Deductions
(27,655
)
Balance as of December 31, 2018
$
7,774