Quarterly report pursuant to Section 13 or 15(d)

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details)

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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash, cash equivalents and short-term investments     $ 62,500,000        
Stockholders' equity attributable to parent $ 160,916,000 $ 169,744,000 107,160,000 $ 160,916,000 $ 117,793,000 $ 134,045,000 $ 170,098,000
Net cash used in operating activities     $ (30,320,000) $ (13,104,000)      
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          
Stock Options              
Antidilutive securities excluded from computation of earnings per share, amount     6,926,781 5,895,135      
Warrant              
Antidilutive securities excluded from computation of earnings per share, amount     1,820,686 2,820,687