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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 08, 2021
Jun. 08, 2020
Jun. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Jun. 10, 2022
Jun. 09, 2022
Jan. 12, 2022
Jan. 11, 2022
Sep. 22, 2021
Jun. 07, 2020
Apr. 22, 2018
Common Stock                                
Common stock, shares authorized       300,000,000   300,000,000     300,000,000              
Common stock, par or stated value per share       $ 0.000041666   $ 0.000041666     $ 0.000041666              
Common stock, shares issued       157,800,581   157,800,581     157,004,742              
Common stock, shares outstanding       157,800,581   157,800,581     157,004,742              
Proceeds from the issuance of common stock, net           $ 0 $ 203,155                  
Weighted average grant date fair value, options granted           $ 8.89 $ 24.38                  
Common Stock                                
Common Stock                                
Common stock issued, net of offering costs (in shares)         5,195,856   6,474,099                  
Common Stock | Issuance Of Common Stock Upon Conversion Of Preferred Stock                                
Common Stock                                
Conversion of stock, shares issued             738,961                  
At the Market Offering Program                                
Common Stock                                
Maximum amount of shares to be issued $ 350,000                              
Maximum percentage of commission 3.00%                              
Common stock issued, net of offering costs (in shares)       0 5,195,856 0 6,474,099                  
Proceeds from the issuance of common stock, net         $ 160,300   $ 203,200                  
Weighted average price         $ 31.49   $ 32.12                  
Series A Convertible Preferred Stock                                
Common Stock                                
Preferred stock, shares authorized       17,000   17,000     17,000              
Preferred stock, par or stated value per share       $ 0.001   $ 0.001     $ 0.001              
Conversion of Stock, shares converted       0 0 0 0                  
Conversion of stock, shares issued           500                    
Preferred stock, shares outstanding       194   194     194              
Series A Convertible Preferred Stock | Common Stock                                
Common Stock                                
Common stock available in conversion, shares       97,000   97,000     97,000              
Series A Convertible Preferred Stock | Private Placement                                
Common Stock                                
Preferred stock, par or stated value per share       $ 1,000   $ 1,000                    
Convertible price per share           $ 2.00                    
Series B Convertible Preferred Stock                                
Common Stock                                
Preferred stock, shares authorized       11,500,000   11,500,000     11,500,000              
Preferred stock, par or stated value per share       $ 0.001   $ 0.001     $ 0.001              
Conversion of stock, shares issued           1                    
Preferred stock, shares outstanding       2,842,158   2,842,158     2,842,158              
Series B Convertible Preferred Stock | Issuance Of Common Stock Upon Conversion Of Preferred Stock                                
Common Stock                                
Conversion of stock, shares issued       0 0 0 738,961                  
Series B Convertible Preferred Stock | Common Stock                                
Common Stock                                
Preferred stock, shares outstanding       2,842,158   2,842,158     2,842,158              
Series B Convertible Preferred Stock | IPO                                
Common Stock                                
Preferred stock, par or stated value per share       $ 4.75   $ 4.75                    
Convertible price per share           $ 4.75                    
Blank check                                
Common Stock                                
Preferred stock, shares authorized       50,000,000   50,000,000                    
Stock option                                
Common Stock                                
Unrecognized compensation cost       $ 82,300   $ 82,300                    
Unrecognized compensation cost recognition period           1 year 10 months 28 days                    
RSUs and PRSUs                                
Common Stock                                
Unrecognized compensation cost recognition period           2 years 1 month 9 days                    
Unrecognized compensation cost       31,800   $ 31,800                    
Aggregate intrinsic value of outstanding non-vested RSUs & PRSUs       $ 27,600   $ 27,600                    
Vested           894,760                    
2014 Equity Incentive Plan                                
Common Stock                                
Number of shares available       87,665   87,665                    
The 2018 Plan                                
Common Stock                                
Number of shares available       7,539,570   7,539,570                    
Shares authorized   14,000,000                 14,000,000       6,000,000 6,000,000
Common Stock, Capital Shares Reserved for Future Issuance                   20,700,000            
2020 ESPP                                
Common Stock                                
Common stock issued, net of offering costs (in shares)     80,203     80,203   80,203 80,203              
Shares authorized   500,000                            
Percentage of purchase price   85.00%                            
Stock-based compensation expense       $ 300 $ 500 $ 500 $ 800                  
Unrecognized compensation cost       $ 700   $ 700                    
Unrecognized compensation cost recognition period           5 months 12 days                    
2021 Inducement Plan                                
Common Stock                                
Number of shares available       46,875   46,875                    
Shares authorized                       1,750,000 1,000,000 1,000,000