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Summary of significant accounting policies (Tables) | 12 Months Ended
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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 |

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