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PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - 2017 Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Class of Warrant or Right [Line Items]          
Change in fair value of warrants       $ 4,784 $ (375)
2017 Warrants          
Class of Warrant or Right [Line Items]          
Change in fair value of warrants   $ 5,200 $ 3,100 (4,800) $ (400)
Common Stock | 2017 Warrants          
Class of Warrant or Right [Line Items]          
Warrant exercise threshold 4.99%        
Warrant holder outstanding common stock ownership limitation 19.99%        
Term of warrants 10 years        
Exercise price of warrants (in dollars per share) $ 2.00        
Warrants, fair value   $ 20,500   $ 20,500