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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Balance at Dec. 31, 2017 $ 131,597,444 $ 3,875 $ 295,975,010 $ (164,381,441)
Balance (in shares) at Dec. 31, 2017   38,749,343    
Stock-based compensation 2,113,936   2,113,936  
Net loss (12,418,263)     (12,418,263)
Balance at Mar. 31, 2018 121,293,117 $ 3,875 298,088,946 (176,799,704)
Balance (in shares) at Mar. 31, 2018   38,749,343    
Balance at Dec. 31, 2018 $ 90,264,769 $ 3,894 304,813,603 (214,552,728)
Balance (in shares) at Dec. 31, 2018 38,937,971 38,937,971    
Exercise of stock options $ 525,000 $ 9 524,991  
Exercise of stock options (in shares)   87,500    
Stock-based compensation 2,461,699   2,461,699  
Net loss (15,827,200)     (15,827,200)
Balance at Mar. 31, 2019 $ 77,424,268 $ 3,903 $ 307,800,293 $ (230,379,928)
Balance (in shares) at Mar. 31, 2019 39,025,471 39,025,471