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Related Party Transactions - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2019 USD ($) | Feb. 12, 2018 USD ($) | Dec. 14, 2017 USD ($) | Nov. 30, 2017 USD ($) | Jan. 31, 2018 USD ($) | Apr. 30, 2017 USD ($) | Oct. 31, 2013 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) transaction
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  |  | $ (5,000,000) | $ 0 |
Related party receivable |  |  |  |  |  |  |  |  | 0 | 72,639,000 |
Note obligation |  |  |  |  |  |  |  |  | 0 | 138,687,000 |
Accumulated deficit |  |  |  |  |  |  |  |  | 123,025,000 | 75,543,000 |
Deemed distribution to parent |  |  |  |  |  |  |  |  | (2,000,000) | (66,048,000) |
Non-cash related party receivable |  |  |  |  |  |  |  |  | 73,690,000 | (72,639,000) |
Liquidated damages |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Period in which liquidated damages will be awarded |  |  |  |  |  |  |  |  | 30 days |  |
Majority Shareholder |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of service agreement |  |  |  |  | 1 year |  |  |  |  |  |
Period of successive renewal of services agreement |  |  |  |  | 1 year |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  | $ (5,000,000) |  |  |
Related party receivable |  |  |  |  |  |  |  |  | $ 0 | $ 72,600,000 |
Period available to cure breach |  |  | 30 days |  |  |  |  |  |  |  |
Unwinding fee |  |  |  | $ 9,600,000 |  |  |  |  |  |  |
Convertible Note | Majority Shareholder |  |  |  |  |  |  |  |  |  |  |
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%
Note obligation |  |  |  |  |  |  |  |  |  | $ 138,700,000 |
Convertible Note | Bridge Note | Majority Shareholder |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 2,500,000.0
Convertible Note | Purchase Agreement | Majority Shareholder |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 55,000,000
Additional amount authorized for issuance |  |  |  |  |  | $ 30,000,000 |  |  |  |  |
ALPHAEON |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deemed distribution to parent |  |  |  |  |  |  |  |  |  | (66,100,000) |
ALPHAEON | Majority Shareholder |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price on debt |  |  |  |  |  |  |  |  | 2.50% |  |
Notes receivable from related parties |  |  |  |  |  |  |  |  | $ 56,300,000 |  |
Accumulated deficit |  |  |  |  |  |  |  |  | 600,000 | 4,300,000 |
Total amounts of transaction |  |  |  |  |  |  |  |  | 140,700,000 | 2,000,000 |
Non-cash related party receivable |  | $ 73,700,000 |  |  | $ 1,100,000 |  |  |  | 73,690,000 |  |
Capital contribution |  | 67,000,000 |  |  |  |  |  |  |  |  |
ALPHAEON |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party borrowings and non-cash capital contribution |  |  |  |  |  |  |  |  |  | 2,500,000 |
ALPHAEON | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party receivable |  |  |  |  |  |  |  |  | 100,000 |  |
Related party transaction amount in period |  |  |  |  |  |  |  |  | 800,000 |  |
Evolus, Inc. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  | $ 1,600,000 |  |  |  |  |  |  |  |
Percentage of voting interests acquired (at least) |  |  | 50.00% |  |  |  |  |  |  |  |
Evolus, Inc. | SCH |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount in period |  | 55,700,000 | $ 20,000,000 |  |  |  |  |  |  |  |
Amounts of transaction related to contingent royalty obligation |  | 39,700,000 |  |  |  |  |  |  |  |  |
Amounts of transaction related to contingent promissory note |  | $ 16,000,000 |  |  |  |  |  |  |  |  |
Period of anniversary |  |  | 2 years 6 months |  |  |  |  |  |  |  |
Period of termination of first commercial sale |  |  | 10 years |  |  |  |  |  |  |  |
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 |  |  |  |
Contingent royalty obligation payable to Evolus Founders, a related party |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent royalty obligation, fair value |  |  |  |  |  |  |  |  | 50,200,000 | $ 0 |
Change in fair value recorded in operating expenses |  |  |  |  |  |  |  |  | $ 10,500,000 |  |
Subsequent Event | Evolus, Inc. | Chief Medical Officer |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due to related parties | $ 700,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event | Evolus, Inc. | SCH |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Up-front payment upon obtaining FDA approval | $ 9,200,000 |  |  |  |  |  |  |  |  |  |

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