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CONVERTIBLE NOTES - Additional information (Details)
1 Months Ended 12 Months Ended
Dec. 07, 2016
USD ($)
shares
Dec. 01, 2016
USD ($)
Jun. 30, 2018
USD ($)
shares
Jul. 24, 2017
USD ($)
Dec. 31, 2020
USD ($)
D
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Sep. 18, 2013
USD ($)
Net proceeds from issuance of convertible notes       $ 9,500,000          
Amount of redemption of debt         $ 0 $ 0      
Percentage of outstanding capital stock         100.00%        
Converted instrument, shares issued | shares 2,384,673                
Net payment for convertible notes             $ 4,752,000    
Promissory note         $ 4,086,000 $ 4,301,000      
Convertible Notes Payable [Member]                  
Principal amount                 $ 69,000,000.0
2021 Notes [Member]                  
Principal amount   $ 22,500,000   10,000,000.0          
Number of shares for basis conversion | shares         117.64706        
Net proceeds from issuance of convertible notes   $ 19,700,000              
Interest rate   7.50%     7.50%        
Conversion price per share | $ / shares         $ 8.50        
Base value for conversion rate         $ 1,000        
Minimum cash balance required         $ 7,500,000        
Maximum price per share of the conversion feature | shares         178.73100        
Denomination of the principal amount of debt         $ 1,000        
Redemption price, percentage         100.00%        
2021 Notes [Member] | Minimum [Member]                  
Number of calendar days after the date of applicable fundamental change purchase date | D         20        
2021 Notes [Member] | Maximum [Member]                  
Number of calendar days after the date of applicable fundamental change purchase date | D         35        
4.5% Convertible Notes [Member]                  
Principal amount   $ 54,100,000 $ 3,423,000 $ 9,000,000.0       $ 54,100,000  
Debt conversion converted instrument amount, cash     $ 2,230,000            
Converted instrument, shares issued | shares     261,363            
Net payment for convertible notes     $ 2,530,000            
Convertible Notes Due Two Thousand Twenty One [Member]                  
Principal amount $ 40,186,000                
Convertible Notes 2013 [Member]                  
Interest rate                 4.50%
2021 Notes [Member]                  
Redemption, description             Prior to the maturity date, the Company may redeem in cash:    
Converted instrument, shares issued | shares             153,742    
Net payment for convertible notes             $ 15,887    
Promissory note         $ 57,900,000        
Debt conversion, original debt, amount             $ 1,150,000    
Four Point Five Percentage Convertible Notes 2022 [Member]                  
Maturity         Nov. 15, 2021        
Four Point Five Percentage Convertible Notes 2018 [Member]                  
Interest rate         4.50%