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LIQUIDITY (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 22, 2021
Jan. 14, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accumulated deficit     $ 495,600    
Cash and cash equivalents     $ 37,237   $ 25,522
Sale of Stock, Number of Shares Issued in Transaction   6,670,000      
Common Stock, Par or Stated Value Per Share   $ 0.001 $ 0.001   $ 0.001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights     18,372,496    
Proceeds from exercise of warrants $ 900   $ 6,671  
Letter Agreement [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Warrant exercise price per share $ 0.624        
Agreement description The holder of the warrants may not exercise any portion of the warrants to the extent that the holder would own more than 4.99% of the outstanding common stock immediately after exercise, which percentage may be changed at the holder’s election to a lower percentage at any time or to a higher percentage not to exceed 9.99% upon 61 days’ notice to the Company. The Company also issued to designees of the placement agent for the registered direct offering in December 2020, warrants to purchase 6.0% of the aggregate number of new warrants issued under the letter agreement (or warrants to purchase up to 480,962 shares of common stock)        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 10,688,043        
Letter Agreement [Member] | Holder [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Common Stock, Par or Stated Value Per Share $ 0.001        
Shares Issued, Price Per Share 0.125        
Warrant exercise price per share $ 1.20        
Warrants and Rights Outstanding, Term 5 years        
Maximum [Member] | Letter Agreement [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 10,688,043        
Maximum [Member] | Letter Agreement [Member] | Holder [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 8,016,033        
Pre-funded Warrants [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Warrant exercise price per share   $ 1.375 $ 0.001    
Warrant exercise percentage   125.00%      
IPO [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Common Stock, Par or Stated Value Per Share   $ 0.001      
Warrants and Rights Outstanding, Term   5 years      
Agreement description     The holder of the warrants may not exercise any portion of the warrants to the extent that the holder would own more than 4.99% of the outstanding common stock immediately after exercise, which percentage may be changed at the holder’s election to a lower percentage at any time or to a higher percentage not to exceed 9.99% upon 61 days’ notice to the Company. The Company also issued to designees of the placement agent for the registered direct offering, warrants to purchase up to 6.0% of the aggregate number of common stock shares and pre-funded warrants sold in the offering (or warrants to purchase up to 545,455 shares of common stock)    
IPO [Member] | Maximum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   9,090,910      
IPO [Member] | Pre-Funded Warrant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   2,420,910      
Shares Issued, Price Per Share   $ 1.099      
Warrant exercise price per share   0.001      
IPO [Member] | Common Stock and Warrant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Shares Issued, Price Per Share   1.100      
IPO [Member] | Warrant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Shares Issued, Price Per Share   1.10      
Warrant exercise price per share   $ 1.20      
Private Placement [Member] | Maximum [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   545,455      
Private Placement [Member] | Warrant [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Proceeds from exercise of warrants $ 6,700 $ 9,200