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Research and Development Arrangements (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
May 04, 2019
Apr. 29, 2019
Ligand Pharmaceuticals Incorporated        
Collaborative Arrangements Transactions [Line Items]        
Immediate funding     $ 12,000,000  
Potential regulatory and commercial milestones payable under agreement     $ 20,000,000  
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      
SB206 | Ligand Pharmaceuticals Incorporated        
Collaborative Arrangements Transactions [Line Items]        
Immediate funding     $ 12,000,000  
Research and development contra expense $ (8,185,000)      
Restricted Cash | SB206 | Ligand Pharmaceuticals Incorporated        
Collaborative Arrangements Transactions [Line Items]        
Immediate funding     $ 12,000,000  
Reedy Creek Investments LLC        
Collaborative Arrangements Transactions [Line Items]        
Immediate funding       $ 25,000,000
Additional funding potentially receivable       $ 10,000,000
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 15.00%      
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
Reedy Creek Investments LLC | Subsequent event        
Collaborative Arrangements Transactions [Line Items]        
Royalty and milestone agreement funding, amount not expected to be received   $ 10,000,000