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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Apr. 05, 2021
USD ($)
$ / shares
shares
Mar. 30, 2021
$ / shares
shares
Dec. 15, 2020
USD ($)
$ / shares
Dec. 11, 2020
$ / shares
shares
Jun. 30, 2020
shares
May 04, 2020
USD ($)
$ / shares
shares
Apr. 29, 2020
USD ($)
$ / shares
shares
Dec. 19, 2019
shares
Dec. 31, 2021
USD ($)
segment
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Oct. 02, 2020
USD ($)
Jul. 22, 2020
USD ($)
Apr. 28, 2020
$ / shares
Apr. 29, 2019
$ / shares
Significant Accounting Policies Disclosure [Line Items]                            
Sale of stock, shelf registration maximum equity offering price | $                     $ 200,000,000      
Exercise price of warrants or rights (in dollars per share) | $ / shares             $ 0.10              
Expected term           5 years                
Ratio of shares issued per warrant               1.2            
Issuance of common stock (in shares)             12,230,418              
Proceeds from issuance of common stock | $             $ 1,200,000   $ 34,500,000 $ 37,147,681        
Preferred stock, par value (in dollars per share) | $ / shares             $ 0.0001   $ 0.0001 $ 0.0001        
Proceeds from issuance of preferred stock and warrants | $           $ 22,600,000     $ 0 $ 22,560,994        
Proceeds from issuance of preferred stock and warrants, net | $           19,200,000                
Shares issued, price per share (in usd per share) | $ / shares $ 1.00   $ 0.65                      
Property, plant and equipment, useful life                 3 years          
Exercise of warrants, net of commissions (in shares)                   1,847,309        
Change in fair value of warrant liabilities | $                 $ 0 $ 2,637,500        
Warrant inducement expense | $                 0 7,157,887        
General and administrative | $                 $ 9,662,875 $ 10,519,955        
Antidilutive securities excluded from computation of earnings per share, amount (in shares)                 43,938,829 56,368,996        
Number of operating segments | segment                 1          
Measurement Input, Exercise Price                            
Significant Accounting Policies Disclosure [Line Items]                            
Measurement input | $ / shares                         0.10  
Certificates of Deposit                            
Significant Accounting Policies Disclosure [Line Items]                            
Interest rate                 0.02%          
Chief Executive Officer, Chief Financial Officer, And Chairman Of Board Of Directors                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)         7,507,300                  
Consideration received on transaction | $           $ 4,400,000                
Patent Costs                            
Significant Accounting Policies Disclosure [Line Items]                            
General and administrative | $                 $ 470,000 $ 434,000        
Long-Term Warrants | Measurement Input, Exercise Price                            
Significant Accounting Policies Disclosure [Line Items]                            
Measurement input | $ / shares                         0.10  
Warrant                            
Significant Accounting Policies Disclosure [Line Items]                            
Exercise price of warrants or rights (in dollars per share) | $ / shares                           $ 2.13
Number of securities called by warrants or rights (in shares)               5,441,023   1,847,309        
Number of warrants purchased (in shares)                   1,539,424        
Change in fair value of warrant liabilities | $                   $ 1,969,200        
Warrant | Minimum                            
Significant Accounting Policies Disclosure [Line Items]                            
Expected term                 1 year          
Warrant | Maximum                            
Significant Accounting Policies Disclosure [Line Items]                            
Expected term                 5 years 6 months          
Placement Agent Warrants                            
Significant Accounting Policies Disclosure [Line Items]                            
Exercise price of warrants or rights (in dollars per share) | $ / shares                           $ 2.53
Expected term                           5 years
Exchange Warrants                            
Significant Accounting Policies Disclosure [Line Items]                            
Warrant inducement expense | $                   7,200,000        
Offer To Amend And Exercise                            
Significant Accounting Policies Disclosure [Line Items]                            
Warrants, accumulated gross unrealized gain | $                   1,058,700        
Private Placement | Series A Preferred Stock                            
Significant Accounting Policies Disclosure [Line Items]                            
Exercise price of warrants or rights (in dollars per share) | $ / shares           $ 58.94     $ 0.5894          
Expected term             5 years              
Number of securities called by warrants or rights (in shares)           382,779                
Ratio of warrant issuable per investment unit             1              
Ratio of shares issuable per investment unit             1              
Broker Warrants                            
Significant Accounting Policies Disclosure [Line Items]                            
Units and warrant units issued (in shares)           8,112                
Broker Warrants | Series A Preferred Stock                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of securities called by warrants or rights (in shares)           10,899                
Public Stock Offering                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)   30,000,000   46,153,847                    
Consideration received on transaction | $ $ 31,500,000   $ 32,000,000                      
Shares issued, price per share (in usd per share) | $ / shares   $ 1.00   $ 0.65                    
Public Stock Offering | Officers And Board Of Directors Chairman                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)       446,153                    
Over-Allotment Option                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)   4,500,000   6,923,077                    
Sale of stock, option period   30 days   30 days                    
April 2021 Offering                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares) 34,500,000                          
Consideration received on transaction | $                 $ 34,500,000          
April 2021 Offering | Chief Executive Officer, Chief Financial Officer, And Chairman Of Board Of Directors                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares) 450,000                          
Consideration received on transaction | $ $ 450,000                          
Warrant                            
Significant Accounting Policies Disclosure [Line Items]                            
Warrant liabilities outstanding | $                 0 0        
Exchange of warrants | $                 $ 0 $ 380,600        
Series A Preferred Stock | Private Placement                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)           382,779                
Number of securities called by warrants or rights (in shares)           382,779                
Preferred stock, par value (in dollars per share) | $ / shares           $ 0.0001                
Common shares issuable upon conversion (in shares)         38,277,900 38,277,900                
Series A Preferred Stock | Private Placement | Chief Executive Officer, Chief Financial Officer, And Chairman Of Board Of Directors                            
Significant Accounting Policies Disclosure [Line Items]                            
Number of shares issued on transaction (in shares)           75,073                
Series A Preferred Stock | Broker Warrants                            
Significant Accounting Policies Disclosure [Line Items]                            
Common shares issuable upon conversion (in shares)           2,712,300                
SunTrust Robinson Humphrey                            
Significant Accounting Policies Disclosure [Line Items]                            
Sale of stock, ATM maximum equity offering price | $                       $ 40,000,000    
Common Stock                            
Significant Accounting Policies Disclosure [Line Items]                            
Issuance of common stock (in shares)                 37,017,211 56,611,767        
Conversion of preferred stock to common stock (in shares)         38,277,900         38,277,900