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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock issued (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 27, 2022
Jan. 26, 2022
Jun. 12, 2020
Jun. 04, 2020
Jan. 28, 2020
Feb. 28, 2021
Jun. 30, 2020
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Sale of stock                      
Common Stock, par value (in dollars per share)                 $ 0.0001   $ 0.0001
Proceeds from stock issuance, net of cash issuance costs                   $ 74,420  
Common And Pre-Funded Warrants                      
Sale of stock                      
Warrants term 5 years                    
Common Stock                      
Sale of stock                      
Issuance of common stock (in shares)               3,450,000      
Common Stock, par value (in dollars per share)                 $ 0.0001 $ 0.0001  
Secondary Public Offering, 2020                      
Sale of stock                      
Issue price (in dollars per share)         $ 45.50            
Proceeds from stock issuance, net of cash issuance costs         $ 134,100            
Secondary Public Offering, Excluding Underwriters' Option                      
Sale of stock                      
Issuance of common stock (in shares)         2,741,489            
Secondary Public Offering, Underwriters' Option                      
Sale of stock                      
Issuance of common stock (in shares)         411,223            
Shelf Registration Statement                      
Sale of stock                      
Maximum value of shares authorized to be sold in stock offering       $ 300,000              
Goldman Equity Distribution Agreement                      
Sale of stock                      
Maximum value of shares authorized to be sold in stock offering     $ 100,000       $ 100,000        
Maximum amount to be paid to sales agent (as a percent)             3.00%        
February Offering, 2021                      
Sale of stock                      
Issuance of common stock (in shares)           3,450,000          
Issue price (in dollars per share)           $ 23.00          
Proceeds from stock issuance, net of cash issuance costs           $ 74,400          
February Offering Underwriters' Option                      
Sale of stock                      
Issuance of common stock (in shares)           450,000          
Cowen Equity Distribution Agreement                      
Sale of stock                      
Issuance of common stock (in shares)                 0    
Maximum value of shares authorized to be sold in stock offering   $ 100,000                  
Maximum amount to be paid to sales agent (as a percent)   3.00%                  
June Offering                      
Sale of stock                      
Issuance of common stock (in shares) 20,000,000                    
Common Stock, par value (in dollars per share) $ 0.0001                    
Issue price per share and accompanying warrant (in dollars per share) 1.00                    
Issue price per pre-funded warrant and accompanying warrant (in dollars per share) $ 0.9999                    
Proceeds from issuance of shares and pre-funded warrants, net $ 27,800                    
June Offering | Common And Pre-Funded Warrants                      
Sale of stock                      
Warrants term 5 years                    
Threshold percentage of aggregate beneficial ownership of holder for exercising warrants 9.99%                    
Threshold percentage of aggregate beneficial ownership of holder (together with affiliates) for exercising warrants 19.99%                    
June Offering | Pre-Funded Warrants                      
Sale of stock                      
Warrants to purchase common stock (in shares) 10,000,000                    
Warrants term                 5 years    
June Offering | Common Warrants                      
Sale of stock                      
Warrants to purchase common stock (in shares) 30,000,000                    
Warrants term                 5 years