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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]        
Stock options $ 374,000 $ 512,000 $ 3,004,000 $ 1,741,000
Warrants 263,000 229,000 1,918,000 682,000
Restricted stock units 75,000 23,000 311,000 28,000
Earn-out compensation expense (Note 5) 25,000 0 33,000 0
Total noncash stock compensation expense $ 737,000 $ 764,000 $ 5,266,000 $ 2,451,000