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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 $ 59 2,889,184 0 2,889,243
Stock-based compensation (in shares) 59,040      
Net loss $ 0 0 (10,889,316) (10,889,316)
Ending Balance at Jun. 30, 2019 $ 45,513 368,353,041 (316,994,766) 51,403,788
Ending Balance (in shares) at Jun. 30, 2019 45,513,523      
Beginning Balance at Mar. 31, 2019 $ 45,484 366,989,803 (311,424,375) 55,610,912
Beginning Balance (in shares) at Mar. 31, 2019 45,484,483      
Stock-based compensation $ 29 1,363,238 0 1,363,267
Stock-based compensation (in shares) 29,040      
Net loss $ 0 0 (5,570,391) (5,570,391)
Ending Balance at Jun. 30, 2019 $ 45,513 368,353,041 (316,994,766) 51,403,788
Ending Balance (in shares) at Jun. 30, 2019 45,513,523      
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  
Issuance of common stock as commitment fee for future financing (Shares) 345,357      
Stock-based compensation $ 85 2,705,280 0 2,705,365
Stock-based compensation (in shares) 85,110      
Net loss $ 0 0 (12,827,343) (12,827,343)
Ending Balance at Jun. 30, 2020 $ 46,617 374,828,385 (340,360,757) 34,514,245
Ending Balance (in shares) at Jun. 30, 2020 46,617,632      
Beginning Balance at Mar. 31, 2020 $ 46,532 373,467,697 (334,019,058) 39,495,171
Beginning Balance (in shares) at Mar. 31, 2020 46,532,522      
Stock-based compensation $ 85 1,360,688 0 1,360,773
Stock-based compensation (in shares) 85,110      
Net loss $ 0 0 (6,341,699) (6,341,699)
Ending Balance at Jun. 30, 2020 $ 46,617 $ 374,828,385 $ (340,360,757) $ 34,514,245
Ending Balance (in shares) at Jun. 30, 2020 46,617,632