Summary of significant accounting policies (Tables)
 12 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Concentrations of Risk
During the years ended March 31, 2020, December 31, 2018 and 2017, and the three month transition period ended March 31, 2019, two customers individually accounted for greater than 10% of the Company’s net sales as disclosed below:
 
Year ended
March 31,
 
Three months ended March 31,
(transition period)
 
Year ended
December 31,
 
2020
 
2019
 
2018
 
2017
Walmart
31
%
 
36
%
 
30
%
 
29
%
Target
22
%
 
17
%
 
21
%
 
25
%
Customers that individually accounted for greater than 10% of the Company’s accounts receivable at the end of the periods are as presented:
 
March 31, 2020
 
March 31, 2019
 
December 31, 2018
Target

22
%
 
19
%
 
27
%
Walmart

20
%
 
27
%
 
20
%
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 March 31, 2020, December 31, 2018 and 2017, and the transition period for the three months ended March 31, 2019, net sales in the United States and outside of the United States were as follows (in thousands):
 
Year ended
March 31,
 
Three months ended March 31,
(transition period)
 
Year ended
December 31,
 
2020
 
2019
 
2018
 
2017
U.S.
$
255,284

 
$
59,797

 
$
241,159

 
$
243,299

International
27,567

 
6,344

 
26,276

 
26,589

Total net sales
$
282,851

 
$
66,141

 
$
267,435

 
$
269,888
Property and Equipment in United States and Outside of United States
As of March 31, 2020, March 31, 2019, and December 31, 2018, the Company had property and equipment in the United States and outside of the United States as follows (in thousands):
 
March 31, 2020
 
March 31, 2019
 
December 31, 2018
U.S.
$
16,845

 
$
15,491

 
$
21,236

International
326

 
515

 
568

Total property and equipment, net
$
17,171

 
$
16,006

 
$
21,804
Reconciliation of Sales Allowances
A reconciliation of the beginning and ending amounts of the reserve for sales adjustments for the years ended March 31, 2020, December 31, 2018 and 2017, and the transition period for the three months ended March 31, 2019 is as follows (in thousands):
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

Charges
6,787

Deductions
(8,016
)
Balance as of March 31, 2019
6,545

Charges
29,576

Deductions
(28,508
)
Balance as of March 31, 2020
$
7,613