Quarterly report pursuant to Section 13 or 15(d)

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual)

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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash, Cash Equivalents, and Short-term Investments $ 68,300,000        
Stockholders' Equity Attributable to Parent 117,793,000   $ 169,744,000 $ 134,045,000 $ 170,098,000
Net Cash Provided by (Used in) Operating Activities $ (15,078,000)   (4,082,000)    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   $ 543,000 2,067,000    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 543,000 $ 2,067,000    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share   $ 0.01 $ 0.04    
Employee Stock Option [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 5,696,353   5,807,531    
Warrant [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,820,686   2,838,576