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Related Parties - Additional Information (Detail) - Lordship Ventures Histogen Holdings LLC [Member] - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2012
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]            
Percentage of outstanding voting shares controlled       2.80%   2.80%
Success Fee Agreement [Member]            
Related Party Transaction [Line Items]            
Minimum percentage of asset or equity engaged in merger or sale transaction 90.00%          
Related party expense recognized   $ 0 $ 0 $ 0 $ 375  
Allergan License Agreements [Member]            
Related Party Transaction [Line Items]            
Amount due to related parties   $ 9   $ 9   $ 10
Private Histogen [Member] | Success Fee Agreement [Member]            
Related Party Transaction [Line Items]            
Description of related party transaction       In November 2012, Private Histogen entered into a Strategic Relationship Success Fee Agreement with Lordship (the “Success Fee Agreement”). The Success Fee Agreement causes certain payments to be made from the Company to Lordship equal to 1% of certain product revenues and 10% of certain license and royalty revenues generated from their Human Multipotent Cell Conditioned Media, or CCM, and their Human Extracellular Matrix, or hECM, in connection with the Company’s biologics technology platform. The Success Fee Agreement also stipulates that if the Company engages in a merger or sale of all or substantially all (defined as 90% or more) of its assets or equity to a third party, then the Company has the option to terminate the agreement by paying Lordship the fair market value of future payments with the minimum payment being at least equal to the most recent annual payments Lordship has received.    
Private Histogen [Member] | Success Fee Agreement [Member] | Product Revenue [Member]            
Related Party Transaction [Line Items]            
Success fee percentage to be paid on certain product revenues 1.00%          
Private Histogen [Member] | Success Fee Agreement [Member] | License and Royalty Revenue [Member]            
Related Party Transaction [Line Items]            
Success fee percentage to be paid on certain license and royalty revenues 10.00%