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LONG-TERM DEBT (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Longterm Debt Details Narrative Abstract    
Financing expenses, Hercules Loan Agreement $ 2,800  
Amortization of debt issuance costs 77 $ 0
Unamortized balance of debt issuance costs $ (2,689)  
Warrant exercise price $ 4.08  
Warrant fair value $ 1,000