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