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LOAN PAYABLE, ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2015
May 31, 2018
Oct. 31, 2012
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Loans Payable            
Outstanding loan payable           $ 100
Number of warrants outstanding       7,673,130    
2012 Warrant Exercise price $166.00            
Loans Payable            
Number of warrants outstanding       243    
Exercise price of warrant (in dollars per share)       $ 166.00    
Equipment Line of Credit            
Loans Payable            
Interest expense       $ 1 $ 14  
MassDev            
Loans Payable            
Line of credit, maximum     $ 2,000      
Line of credit for working capital purpose     $ 200      
Fixed interest rate (as a percent)     6.50%      
Period for interest-only payments     30 months      
Period for charging equal installments of interest and principal     54 months      
Maturity date     Mar. 01, 2019      
Commencement date of monthly installments May 01, 2015          
Amount of monthly payment $ 41          
Repayment of principal   $ 300   100    
Outstanding loan payable       0    
MassDev | 2012 Warrant Exercise price $166.00            
Loans Payable            
Warrant period     7 years      
Exercise price of warrant (in dollars per share)     $ 166.00      
Fair value of warrants     $ 32      
MassDev | 2012 Warrant Exercise price $166.00 | Interest Expense            
Loans Payable            
Amortization of warrant       $ 1   $ 1
MassDev | 2012 Warrant Exercise price $166.00 | Common Stock            
Loans Payable            
Number of shares into which a warrant may be converted     362      
Number of warrants outstanding       243