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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 29, 2020
Dec. 31, 2019
Apr. 30, 2019
Class of Stock [Line Items]        
Exercise price (in dollars per share)   $ 3.00    
Stock price trigger for redemption of public warrants (in dollars per share) $ 0.01      
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, Stock Price Trigger $ 0.01      
Minimum threshold written notice period for redemption of warrants 30 days      
Closing price of share for threshold trading days 20 days      
Closing price of share for threshold consecutive trading days 3 days      
Class Of Warrant Or Right, Redemption Of Warrants Or Rights, Last Sales Price of the Ordinary Shares $ 18.00      
Warrants outstanding 11,957,008   11,957,008 10,582,008
Public warrants        
Class of Stock [Line Items]        
Warrants outstanding 11,957,008      
Issued With Units In The IPO [Member]        
Class of Stock [Line Items]        
Warrants outstanding 10,582,008   10,582,008  
Issued To E&A Callet [Member]        
Class of Stock [Line Items]        
Warrants outstanding 375,000   375,000  
Issued With Units To Kunlun [Member]        
Class of Stock [Line Items]        
Warrants outstanding 1,000,000   1,000,000