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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
May 08, 2020
Dec. 31, 2019
Preferred stock, shares authorized   10,000,000      
Preferred stock, par value (in dollars per share)   $ 0.001      
Common Stock, Shares Authorized   150,000,000     150,000,000
Common stock, par value (in dollars per share)   $ 0.001     $ 0.001
Percent of commission rate       3.00%  
Number of additional shares that may be issued   28,026      
Expenses on stock options   $ 11,068 $ 1,882    
Warrant [Member]          
Number of shares each right entitles registered holder to purchase   147,058      
Expenses on stock options   $ 0      
Restricted stock [Member]          
Restricted stock outstanding   7,328,852     7,091,789
Number of shares granted   774,300      
Expenses on stock options   $ 7,100 1,200    
Total unrecognized compensation expense related to unvested time-based restricted stock   $ 26,000      
Weighted-average period of recognition for total unrecognized compensation expense related to unvested time-based restricted stock   1 year      
Employee Stock Option [Member]          
Restricted stock outstanding   2,585,980      
Expenses on stock options   $ 3,900 $ 700    
Total unrecognized compensation expense related to unvested time-based restricted stock   $ 2,100      
Weighted-average period of recognition for total unrecognized compensation expense related to unvested time-based restricted stock   1 year 8 months 12 days      
Milestone Based Restricted Stock [Member]          
Restricted stock outstanding   3,003,011      
2020 ATM [Member]          
Shares sold 4,535,608        
Share price in offering $ 17.07        
Proceeds from offering $ 76,000        
Gross proceeds $ 77,400