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Stockholders' Equity (Deficit) - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 21, 2020
USD ($)
$ / shares
shares
Aug. 11, 2020
Nov. 15, 2019
USD ($)
Aug. 31, 2018
USD ($)
shares
Sep. 22, 2017
USD ($)
$ / shares
shares
Sep. 19, 2017
shares
Sep. 30, 2020
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Class Of Stock [Line Items]                  
Number of warrants converted         1,690,672        
Warrants initial exercise price | $ / shares         $ 0.01        
Stock issued during period shares warrants exercised         1,690,672        
Proceeds from exercise of warrants | $         $ 139        
Shares repurchased and cancelled value | $               $ 167  
Reverse stock split ratio, description   1-for-8.215              
Reverse stock split ratio   0.1217              
Preferred stock, conversion basis   1-for-8.215              
Preferred stock conversion ratio   0.1217              
Net proceeds from initial public offering | $               $ 147,628  
Common stock, voting rights               one vote for each share  
Common stock number of shares subject to forfeiture provisions             1,217,285 1,217,285  
Noncash stock compensation expense | $     $ 8,400         $ 1,870 $ 1,104
Common Stock                  
Class Of Stock [Line Items]                  
Shares converted           7,709,434      
Shares issued upon conversion           7,709,434      
Number of shares repurchased and cancelled [1]               12,175  
Issuance of shares upon initial public offering [1]             6,151,162 6,151,162  
Common Stock | IPO                  
Class Of Stock [Line Items]                  
Issuance of shares upon initial public offering 6,151,162                
Shares issued, price per share | $ / shares $ 24.00                
Net proceeds from initial public offering | $ $ 135,435                
Underwriting discounts and commissions and offering expenses | $ $ 12,193                
Common Stock | Over-Allotment Option                  
Class Of Stock [Line Items]                  
Issuance of shares upon initial public offering 802,325                
Common Stock | Chief Executive Officer                  
Class Of Stock [Line Items]                  
Number of shares repurchased and cancelled       1,623,007          
Shares repurchased and cancelled value | $       $ 3,200          
[1] Common stock of Harmony Biosciences Holdings, Inc.