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Summary of significant accounting policies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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Feb. 28, 2019 store | Mar. 31, 2020 USD ($) distribution_channel | Dec. 31, 2019 USD ($) | 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 ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2020 USD ($) segment distribution_channel | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($) | Mar. 31, 2017 customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ 1,000,000 |  |  |  | $ 300,000 | $ 300,000 |  |  |  |  | $ 1,000,000 | $ 300,000 |  |  |  |
Sales allowances |  | 7,600,000 |  |  |  | 6,500,000 | 7,800,000 |  |  |  |  | 7,600,000 | 7,800,000 |  |  |  |
Reserve for excess and obsolete inventory |  | 1,400,000 |  |  |  | 1,700,000 | 2,300,000 |  |  |  |  | 1,400,000 | 2,300,000 |  |  |  |
Property and equipment, net |  | 17,171,000 |  |  |  | 16,006,000 | 21,804,000 |  |  |  |  | $ 17,171,000 | 21,804,000 |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 200,000 |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Retained earnings |  | 511,531,000 |  |  |  | 529,415,000 | 511,501,000 |  |  |  |  | $ 511,531,000 | 511,501,000 |  |  |  |
Net sales |  | 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 |  | 282,851,000 | 267,435,000 | 269,888,000 |  |  |
Accounts receivable, net |  | $ 29,721,000 |  |  |  | 32,275,000 | 36,724,000 |  |  |  |  | $ 29,721,000 | 36,724,000 |  |  |  |
Number of distribution channels | distribution_channel |  | 2 |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Cost of sales |  |  |  |  |  | 25,650,000 |  |  |  | $ 25,712,000 |  | $ 101,728,000 | 104,694,000 | 105,163,000 |  |  |
Advertising costs |  |  |  |  |  | 2,600,000 |  |  |  |  |  | $ 26,000,000 | 10,200,000 | 8,100,000 |  |  |
Payment terms |  |  |  |  |  |  |  |  |  |  |  | The Company extends credit to retail customers based upon an evaluation of their credit quality. The majority of retail customers obtain payment terms between 30-60 days, and a contract asset is recognized for the related accounts receivable. |  |  |  |  |
Operating lease, right-of-use asset |  | $ 13,668,000 |  |  |  | 4,445,000 |  |  |  |  |  | $ 13,668,000 |  |  |  |  |
Operating lease, liability |  |  | $ 14,322,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stores closed | store | 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail Product Displays |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  | $ 10,100,000 |  |  |  | 12,100,000 | 10,900,000 |  |  |  |  | $ 10,100,000 | 10,900,000 |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Amortization expense |  |  |  |  |  | 1,500,000 |  |  |  |  |  | $ 6,000,000 | 3,100,000 | 600,000 |  |  |
Leasehold improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
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 |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Shipping and Handling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | 200,000 |  |  |  |  |  | $ 700,000 | 500,000 | 700,000 |  |  |
Cost of sales |  |  |  |  |  | $ 4,900,000 |  |  |  |  |  | $ 19,800,000 | 20,900,000 | $ 21,200,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,200,000 |  |
Operating lease, liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,500,000 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |
Accounts receivable, net |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  | $ 400,000 |  |  |  |

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