Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total net revenues	$ 34,925	$ 0
Product cost of sales (excludes amortization of intangible assets)	8,014	0
Gross profit	26,911	0
Operating expenses:
Selling, general and administrative	113,593	29,146
Research and development	3,973	6,487
Revaluation of contingent royalty obligation to Evolus Founders	4,160	10,500
Depreciation and amortization	4,132	9
Total operating expenses	125,858	46,142
Loss from operations	(98,947)	(46,142)
Other income (expense):
Interest income	1,839	203
Interest expense	(7,953)	(863)
Loss before income taxes	(105,061)	(46,802)
Income tax (benefit) expense	(15,027)	65
Net loss	(90,034)	(46,867)
Other comprehensive gain:
Unrealized gain on available-for-sale securities, net of tax	6	0
Comprehensive loss	$ (90,028)	$ (46,867)
Net loss per share, basic and diluted (in dollars per share)	$ (3.19)	$ (1.92)
Weighted-average shares outstanding used to compute basic and diluted net loss per share (in shares)	28,237,816	24,402,368
Product revenue, net
Revenue:
Total net revenues	$ 34,237	$ 0
Service revenue
Revenue:
Total net revenues	$ 688	$ 0