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Research and Development Arrangements (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
May 04, 2019
Apr. 29, 2019
Ligand Pharmaceuticals Incorporated          
Collaborative Arrangements Transactions [Line Items]          
Immediate funding       $ 12,000,000.0  
Potential regulatory and commercial milestones payable under agreement       $ 20,000,000.0  
Minimum | Ligand Pharmaceuticals Incorporated          
Collaborative Arrangements Transactions [Line Items]          
Tiered royalties, percentage       7.00%  
Maximum | Ligand Pharmaceuticals Incorporated          
Collaborative Arrangements Transactions [Line Items]          
Tiered royalties, percentage       10.00%  
SB206          
Collaborative Arrangements Transactions [Line Items]          
Restricted cash related to Funding Agreement $ 0   $ 0    
SB206 | Ligand Pharmaceuticals Incorporated          
Collaborative Arrangements Transactions [Line Items]          
Research and development contra expense $ (1,513,000)        
Restricted Cash | SB206 | Ligand Pharmaceuticals Incorporated          
Collaborative Arrangements Transactions [Line Items]          
Immediate funding       $ 12,000,000.0  
Reedy Creek Investments LLC          
Collaborative Arrangements Transactions [Line Items]          
Immediate funding         $ 25,000,000.0
Additional funding potentially receivable         $ 10,000,000.0
Royalty and milestone agreement funding, amount not expected to be received   $ 10,000      
Initial percentage of fees and milestone to determine quarterly payments per agreement         25.00%
Reedy Creek Investments LLC | Novan, Inc.          
Collaborative Arrangements Transactions [Line Items]          
Beneficial ownership percentage 5.00%        
Reedy Creek Investments LLC | SB206          
Collaborative Arrangements Transactions [Line Items]          
Percentage used to determine ongoing quarterly payments per agreement         10.00%
Reedy Creek Investments LLC | SB204 And SB414          
Collaborative Arrangements Transactions [Line Items]          
Percentage used to determine ongoing quarterly payments per agreement         20.00%
Reedy Creek Investments LLC | Cash and Cash Equivalents          
Collaborative Arrangements Transactions [Line Items]          
Immediate funding         $ 25,000,000.0