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Summary of significant accounting policies - Additional Information (Details)	3 Months Ended													12 Months Ended
	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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