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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
Common Stock
Additional Paid- in Capital
Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2018 $ 45,440 $ 365,400,748 $ (306,105,450) $ 59,340,738
Beginning Balance (in shares) at Dec. 31, 2018 45,440,704      
Stock options exercised for cash $ 12 57,732 0 57,744
Stock options exercised for cash (in shares) 11,980      
Warrants exercised for cash $ 2 5,377 0 5,379
Warrants exercised for cash (in shares) 1,799      
Stock-based compensation $ 30 1,525,946 0 1,525,976
Stock-based compensation (in shares) 30,000      
Net loss $ 0 0 (5,318,925) (5,318,925)
Ending Balance at Mar. 31, 2019 $ 45,484 366,989,803 (311,424,375) 55,610,912
Ending Balance (in shares) at Mar. 31, 2019 45,484,483      
Beginning Balance at Dec. 31, 2019 $ 45,728 371,573,909 (327,533,414) 44,086,223
Beginning Balance (in shares) at Dec. 31, 2019 45,728,831      
Warrants exercised for cash $ 459 549,541 0 550,000
Warrants exercised for cash (in shares) 458,334      
Issuance of common stock as commitment fee for future financing $ 345 (345) 0 0
Issuance of common stock as commitment fee for future financing (Shares) 345,357      
Stock-based compensation $ 0 1,344,592 0 1,344,592
Stock-based compensation (in shares) 0      
Net loss $ 0 0 (6,485,644) (6,485,644)
Ending Balance at Mar. 31, 2020 $ 46,532 $ 373,467,697 $ (334,019,058) $ 39,495,171
Ending Balance (in shares) at Mar. 31, 2020 46,532,522