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Unaudited Condensed Statements of Stockholders’ Equity (Deficit) - USD ($)
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Balance (in shares) at Dec. 31, 2017 [1]   11,888,240    
Balance at Dec. 31, 2017 $ (12,174,614) $ 11,888 $ 7,167,189 $ (19,353,691)
Stockholders' Equity [Roll Forward]        
Issuance of common stock (in shares) [1]   7,111,631    
Issuance of common stock and warrants 16,137,661 $ 711 16,136,950  
Stock issuance costs (2,568,079)   (2,568,079)  
Share-based compensation 7,174,000   7,174,000  
Net loss (14,959,744)     (14,959,744)
Change in par value from $0.001 to $0.0001 0 $ (10,699) 10,699  
Issuance of shares as a result of reverse recapitalization (in shares) [1]   1,864,808    
Issuance of shares as a result of reverse recapitalization (978,674) $ 186 (978,860)  
Warrants issued with common stock 1,995,000   1,995,000  
Warrants issued to placement agents 913,000   913,000  
Conversion of convertible debt and accrued interest (in shares) [1]   4,827,001    
Conversion of convertible debt and accrued interest 9,229,819 $ 483 9,229,336  
Beneficial conversion feature 3,077,887   3,077,887  
Balance (in shares) at Mar. 31, 2018 [1]   25,691,680    
Balance at Mar. 31, 2018 7,846,256 $ 2,569 42,157,122 (34,313,435)
Balance (in shares) at Dec. 31, 2017 [1]   11,888,240    
Balance at Dec. 31, 2017 (12,174,614) $ 11,888 7,167,189 (19,353,691)
Stockholders' Equity [Roll Forward]        
Net loss (19,175,296)      
Balance (in shares) at Jun. 30, 2018 [1]   25,695,602    
Balance at Jun. 30, 2018 3,459,176 $ 2,570 41,985,593 (38,528,987)
Balance (in shares) at Mar. 31, 2018 [1]   25,691,680    
Balance at Mar. 31, 2018 7,846,256 $ 2,569 42,157,122 (34,313,435)
Stockholders' Equity [Roll Forward]        
Share-based compensation (184,000)   (184,000)  
Net loss (4,215,552)     (4,215,552)
Exercise of warrants (in shares) [1]   3,922    
Exercise of warrants 12,472 $ 1 12,471  
Balance (in shares) at Jun. 30, 2018 [1]   25,695,602    
Balance at Jun. 30, 2018 3,459,176 $ 2,570 41,985,593 (38,528,987)
Balance (in shares) at Dec. 31, 2018   26,088,820    
Balance at Dec. 31, 2018 (3,659,064) $ 2,609 39,854,297 (43,515,970)
Stockholders' Equity [Roll Forward]        
Issuance of common stock (in shares)   4,886,782    
Issuance of common stock and warrants 11,475,255 $ 489 11,474,766  
Allocation of warrants to liabilities (1,970,000)   (1,970,000)  
Stock issuance costs (319,819)   (319,819)  
Share-based compensation 526,000   526,000  
Issuance of RSUs (in shares)   90,000    
Issuance of RSUs 0 $ 9 (9)  
Net loss (4,434,765)     (4,434,765)
Balance (in shares) at Mar. 31, 2019   31,065,602    
Balance at Mar. 31, 2019 1,617,607 $ 3,107 49,565,235 (47,950,735)
Balance (in shares) at Dec. 31, 2018   26,088,820    
Balance at Dec. 31, 2018 (3,659,064) $ 2,609 39,854,297 (43,515,970)
Stockholders' Equity [Roll Forward]        
Net loss (8,923,005)      
Balance (in shares) at Jun. 30, 2019   35,883,953    
Balance at Jun. 30, 2019 5,006,309 $ 3,589 57,441,695 (52,438,975)
Balance (in shares) at Mar. 31, 2019   31,065,602    
Balance at Mar. 31, 2019 1,617,607 $ 3,107 49,565,235 (47,950,735)
Stockholders' Equity [Roll Forward]        
Issuance of common stock (in shares)   4,318,272    
Issuance of common stock and warrants 8,744,501 $ 432 8,744,069  
Allocation of warrants to liabilities (1,360,000)   (1,360,000)  
Stock issuance costs (389,623)   (389,623)  
Exercise of stock options (in shares)   100,079    
Exercise of stock options 30,064 $ 10 30,054  
Share-based compensation 852,000   852,000  
Issuance of RSUs (in shares)   400,000    
Issuance of RSUs 0 $ 40 (40)  
Net loss (4,488,240)     (4,488,240)
Balance (in shares) at Jun. 30, 2019   35,883,953    
Balance at Jun. 30, 2019 $ 5,006,309 $ 3,589 $ 57,441,695 $ (52,438,975)
[1] Common shares adjusted for the exchange ratio from the reverse recapitalization