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Related Party Transactions - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
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Feb. 12, 2018 USD ($) | Jan. 16, 2018 USD ($) | Dec. 14, 2017 USD ($) | Nov. 30, 2017 USD ($) | Jan. 31, 2018 | Apr. 30, 2017 USD ($) | Oct. 31, 2013 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) transaction
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  |  |  |  |  | $ (5,000,000) | $ 0 |  |
Note obligation |  |  |  |  |  |  |  | $ 0 |  | $ 138,687,000 | $ 0 | 0 |  | $ 138,687,000 |
Related party receivable |  |  |  |  |  |  |  | 0 |  | 72,639,000 | 0 | 0 |  | 72,639,000 |
Deemed distribution to parent |  |  |  |  |  |  |  |  |  |  |  |  |  | (66,100,000) |
Contingent royalty obligation payable to Evolus Founders, a related party | $ 40,600,000 |  |  |  |  |  |  | 51,100,000 |  | 0 | 51,100,000 | 51,100,000 |  | 0 |
Contingent promissory note payable to Evolus Founders, a related party | 16,100,000 |  |  |  |  |  |  | 16,791,000 |  | 0 | 16,791,000 | 16,791,000 |  | 0 |
Liquidated damages |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |
Period in which liquidated damages will be awarded |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |
ALPHAEON |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of service agreement |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Period of successive renewal of services agreement |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Period of notice of termination of services agreement |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |
Related party accounts payable |  |  |  |  |  |  |  | 0 |  | 72,600,000 | 0 | $ 0 |  | 72,600,000 |
Redemption price on debt |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Total amounts of transaction |  | $ 140,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable from related parties |  | $ 56,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Period available to cure breach |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Unwinding fee |  |  |  | $ 9,600,000 |  |  |  |  |  |  |  |  |  |  |
Related party borrowings and non-cash capital contribution |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 |
ALPHAEON | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount in period |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Related party receivable |  |  |  |  |  |  |  | 100,000 |  |  | 100,000 | 100,000 |  |  |
ALPHAEON | Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  |  |  | $ (2,500,000) |  |  |  |  |
ALPHAEON | Convertible Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, number of debt transactions | transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Interest rate on debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Redemption price on debt |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  | 2.50% | 2.50%
ALPHAEON | Convertible Note | Bridge Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000.0
ALPHAEON | Convertible Note | Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000,000
Additional amount authorized for issuance |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Evolus, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Evolus, Inc. | Chief Medical Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Evolus, Inc. | SCH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount in period | $ 56,700,000 |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Up-front payment upon obtaining FDA approval |  |  | $ 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Period of anniversary |  |  | 2 years 6 months |  |  |  |  |  |  |  |  |  |  |  |
Class D | Evolus, Inc. | SCH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Up-front payment upon obtaining FDA approval |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
One-time lump sum payment |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  |  |  |  |
IPO | ALPHAEON |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  |  | $ (5,000,000) |  |  | (5,000,000) |  |  |
Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent royalty obligation payable to Evolus Founders, a related party |  |  |  |  |  |  |  | 51,100,000 |  |  | 51,100,000 | $ 51,100,000 |  |  |
Change in fair value |  |  |  |  |  |  |  | $ 2,300,000 |  |  | $ 11,400,000 |  |  |  |

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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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