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Summary of significant accounting policies - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2018 USD ($) customer distribution_channel | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) customer | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment customer distribution_channel | Dec. 31, 2017 USD ($) customer | Dec. 31, 2016 USD ($) customer | Jan. 01, 2018 USD ($) | Jan. 31, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 300,000 |  |  |  | $ 100,000 |  |  |  | $ 300,000 | $ 100,000 |  |  |
Sales allowances | 7,800,000 |  |  |  | 8,500,000 |  |  |  | 7,800,000 | 8,500,000 |  |  |
Reserve for excess and obsolete inventory | 2,300,000 |  |  |  | 1,500,000 |  |  |  | 2,300,000 | 1,500,000 |  |  |
Adjustments for excess and obsolete inventory |  |  |  |  |  |  |  |  | 800,000 | 1,500,000 |  |  |
Property and equipment, net | 21,804,000 |  |  |  | 18,037,000 |  |  |  | 21,804,000 | 18,037,000 |  |  |
Impairment charges |  |  |  |  |  |  |  |  | $ 0 | 200,000 | $ 0 |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  | 1 |  |  |  |
Retained earnings | 511,501,000 |  |  |  | 526,972,000 |  |  |  | $ 511,501,000 | 526,972,000 |  |  |
Net sales | 78,571,000 | $ 63,889,000 | $ 59,055,000 | $ 65,920,000 | 81,593,000 | $ 71,865,000 | $ 55,856,000 | $ 60,574,000 | 267,435,000 | 269,888,000 | 229,567,000 |  |
Accounts receivable, net | $ 36,724,000 |  |  |  | 44,634,000 |  |  |  | 36,724,000 | 44,634,000 |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 104,694,000 | 105,163,000 | 97,332,000 |  |
Number of distribution channels | distribution_channel | 3 |  |  |  |  |  |  |  | 3 |  |  |  |
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. |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 10,200,000 | 8,100,000 | $ 5,600,000 |  |
Retail Product Displays |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net | $ 10,900,000 |  |  |  | $ 5,700,000 |  |  |  | $ 10,900,000 | 5,700,000 |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | $ 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 |  |  |  | 2 |  |  |  | 2 | 2 | 2 |  |
Shipping and Handling |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 500,000 | $ 700,000 | $ 1,400,000 |  |
Cost of sales |  |  |  |  |  |  |  |  | 20,900,000 | $ 21,200,000 | $ 20,400,000 |  |
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 |  |  |  |
e.l.f. Cosmetics, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%

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