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STOCKHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 2020
STOCKHOLDERS' EQUITY  
Schedule of assumptions

 

  Six Months Ended June 30,  
    2020     2019  
Expected term  5.5 - 6.3 years     5.8 - 6.3 years  
Volatility  62%-67%     54%-62%  
Dividend yield 

0.0

   

0.0

 
Risk-free interest rate 

0.38-1.68%

   

1.80-2.92%

 
Schedule of compensation expense
    Shares     Weighted Average Grant Date Fair Value  
Balance at December 31, 2019     -    $- 
Granted     341,000    $2.80 
Vested     -    $- 
Forfeited     (15,000)  $2.92 
Balance at June 30, 2020     326,000    $2.80 
Schedule of option activity
    Shares     Weighted Average Exercise Price  
Balance at December 31, 2019    5,630,351    $4.76 
Forfeited    (47,683)  $3.51 
Expired    (6,763)  $4.34 
Granted    1,232,500    $2.96 
Exercised    (6,626)  $2.03 
Balance at June 30, 2020    6,801,779    $4.45 
                 
Options exercisable    4,030,098    $5.19 
Schedule of stock-based compensation expense
    Three Months Ended June 30,     Six Months Ended June 30,  
    2020     2019     2020     2019  
Research and development  $105,029    $89,543    $198,603    $176,066 
Plasma centers    8,510      13,213      15,754      24,753 
Selling, general and administrative    539,256      569,349      1,063,145      1,067,820 
Cost of product revenue    62,813      54,631      114,654      95,360 
Total stock-based compensation expense   $715,608    $726,736    $1,392,156    $1,363,999