Quarterly report pursuant to Section 13 or 15(d)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]    
Stock options $ 1,292,000 $ 632,000
Warrants 1,287,000 225,000
Restricted stock units 151,000 3,000
Total noncash stock compensation expense $ 2,730,000 $ 860,000