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Stock Incentive and Employee Benefit Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2020
May 31, 2019
Mar. 31, 2019
Mar. 17, 2019
Dec. 31, 2018
Compensation And Employee Benefit Plans [Line Items]                        
Share based compensation arrangement,Options outstanding         28,163,510              
Share based compensation arrangement,Options outstanding   30,804,000 25,159,760   28,163,000 30,804,000 25,411,000         4,781,000
Total unrecognized compensation costs     $ 3.9   $ 8.8              
Weighted average period     1 year 4 months 24 days   1 year 9 months 18 days              
Fair value per share of common stock on date of grant   $ 1.16       $ 1.16 $ 1.16 $ 1.16 $ 1.16 $ 1.16 $ 1.16  
Share-Based Payment Arrangement, Option [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Payment to employees     $ 0.3 $ 0.2                
401(k) Plan [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Defined contribution plan matching contribution amount         $ 0.3 $ 0.3 $ 0.3          
Operating Expenses [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Stock based compensation expense     $ 4.0 $ 4.4 $ 5.8 $ 5.4 $ 4.3          
Scilex Pharma 2017 Plan [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Number of shares reserved for issuance under plan 24,000,000                      
Share based compensation arrangement,vesting rights Stock options granted under the Scilex Pharma 2017 Plan typically vest 1/4th of the shares on the first anniversary of the vesting commencement date and 1/48th of the remaining options vest each month thereafter.                      
Share based compensation arrangement,Options outstanding     1,105,000   1,420,000              
2019 Stock Option Plan [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Number of shares reserved for issuance under plan   45,000,000       45,000,000 30,000,000          
Share based compensation arrangement,vesting rights   Stock options granted under the 2019 Stock Option Plan typically vest with respect to 1/4th of the shares on the first anniversary of the vesting commencement date and 1/48th of the remaining shares on each monthly anniversary thereafter. 20,945,240   18,256,490 Stock options granted under the 2019 Stock Option Plan typically vest with respect to 1/4th of the shares on the first anniversary of the vesting commencement date and 1/48th of the remaining shares on each monthly anniversary thereafter.            
Share based compensation arrangement,Options outstanding     24,054,760   26,743,510              
Amendment to 2019 Stock Option Plan [Member]                        
Compensation And Employee Benefit Plans [Line Items]                        
Number of shares reserved for issuance under plan   15,000,000       15,000,000