Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (DEFICIT) - Additional Information (Details)

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STOCKHOLDERS' EQUITY (DEFICIT) - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Jul. 23, 2019
Jun. 19, 2019
Jan. 31, 2019
Aug. 31, 2019
Jul. 23, 2019
Apr. 30, 2019
Jan. 31, 2019
Aug. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Class of Stock [Line Items]                        
Qualified expenditures                 $ 1,600 $ 2,300    
Restricted cash balance                 $ 1,530 $ 1,530   $ 0
Cash proceeds from equity offering     $ 25,000     $ 113,600 $ 25,000 $ 22,600        
Stock Issued During Period, Shares, New Issues 69,000,000             82,900,000        
Purchase of Common Stock                   10,000,000    
Share Price                 $ 0.29 $ 0.29    
Volume weighted average closing price of common stock                   75.00%    
Purchase of Common Stock                   10,000,000    
Proceeds from Stock Options Exercised                   $ 4,300    
Early payments obligation                 $ 3,400 3,400    
Common Stock, No Par Value       $ 0.001       $ 0.001        
Maximum                        
Class of Stock [Line Items]                        
Stock Issued During Period, Shares, Reverse Stock Splits       100                
Minimum                        
Class of Stock [Line Items]                        
Stock Issued During Period, Shares, Reverse Stock Splits       20                
Other Investors [Member]                        
Class of Stock [Line Items]                        
Stock Issued During Period, Shares, New Issues   10,000,000           14,000,000        
Share Price       $ 0.29       $ 0.29        
Gross proceeds from issuance of common stock               $ 4,100   $ 4,050 $ 0  
Investor [Member]                        
Class of Stock [Line Items]                        
Cash proceeds from equity offering $ 20,000                      
Stock Issued During Period, Shares, New Issues   20,000,000     69,000,000              
Share Price $ 0.29       $ 0.29              
VWAP for the previous thirty consecutive trading days $ 0.20                      
Percent of advisory fee payable               6.00%        
Amount of advisory fee payable       $ 1,500       $ 1,500        
Proceeds from Stock Options Exercised $ 20,000                      
Private Placement [Member]                        
Class of Stock [Line Items]                        
Stock Issued During Period, Shares, New Issues                   13,100,000    
Gross proceeds from issuance of common stock                   $ 3,800    
Private Placement [Member] | Investor [Member]                        
Class of Stock [Line Items]                        
Net proceeds from private placement                   $ 22,600