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STOCKHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 2020
Stockholders' equity:  
Warrant activity
    Number     Average Purchase Price Per Share  
Shares purchasable under outstanding warrants at December 31, 2019     6,620,620     $ 5.41  
Stock purchase warrants issued     2,066,667     $ 6.00  
Stock purchase warrants exercised     (2,085,200 )   $ 4.92  
Shares purchasable under outstanding warrants at June 30, 2020     6,602,087     $ 5.75  
Stock purchase warrants
    Number of     Exercise Price  

Description

  Common Shares     Per Share  
Purchase Warrants (1)     2,364,237     $ 5.00  
Agent Warrants     177,954     $ 3.00  
Purchase Warrants     1,839,383     $ 6.50  
Agent Warrants     153,846     $ 8.125  
Purchase Warrants     2,066,667     $ 6.00  
      6,602,087          

 

(1) Warrants to purchase 233,334 shares of common stock are held by a family trust of Elwood G. Norris, the Company’s Chief Technology Officer. Mr. Norris exercised the 233,334 warrants in July 2020 for cash of $1,166,670.