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Summary of significant accounting policies - Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 USD ($) distribution_channel | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2021 USD ($) segment distribution_channel | Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 200,000 |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  | $ 200,000 | $ 1,000,000.0 |
Sales allowances | 11,900,000 |  |  |  | 7,600,000 |  |  |  |  |  |  |  |  | 11,900,000 | 7,600,000 |
Reserve for excess and obsolete inventory reduction | (3,600,000) |  |  |  | (1,400,000) |  |  |  |  |  |  |  |  | (3,600,000) | (1,400,000) |
Property and equipment, net | $ 13,770,000 |  |  |  | 17,171,000 |  |  |  |  |  |  |  |  | 13,770,000 | 17,171,000 |
Impairment of long-lived assets held-for-use |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 0 | 0 | $ 0
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of distribution channels | distribution_channel | 2 |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Net sales | $ 92,671,000 | $ 88,562,000 | $ 72,350,000 | $ 64,527,000 | 74,712,000 | $ 80,760,000 | $ 67,615,000 | $ 59,764,000 | 66,141,000 | $ 78,571,000 | $ 63,889,000 | $ 59,055,000 | $ 65,920,000 | $ 318,110,000 | 282,851,000 | 267,435,000
Cost of sales |  |  |  |  |  |  |  |  | 25,650,000 |  |  |  | $ 25,712,000 | 111,912,000 | 101,728,000 | 104,694,000
Advertising costs |  |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  | $ 30,300,000 | $ 26,000,000.0 | $ 10,200,000
Revenue | Two Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  | 10.00% | 10.00% | 10.00%
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Retail Product Displays |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | $ 9,700,000 |  |  |  | $ 10,100,000 |  |  |  |  |  |  |  |  | $ 9,700,000 | $ 10,100,000 |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Amortization expense |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  | $ 5,200,000 | 6,000,000.0 | $ 3,100,000
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles, estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles, estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Shipping and Handling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  | $ 800,000 | 700,000 | 500,000
Cost of sales |  |  |  |  |  |  |  |  | $ 4,900,000 |  |  |  |  | $ 26,400,000 | $ 19,800,000 | $ 20,900,000

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