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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Preferred Stock [Member]
Series A-1 Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series B-1 Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Series A-1 Convertible Preferred Stock [Member]
Series B-1 Convertible Preferred Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 62,596 105,000 7,691,324     62,596 105,000  
Balance at Dec. 31, 2017 $ 6 $ 11 $ 769 $ 80,829,001 $ (67,076,492)     $ 13,753,295
Issuance of common stock for directors’ fees (in shares) 8,421          
Issuance of common stock for directors’ fees $ 1 16,512     16,513
Share-based compensation 533,421     533,421
Net loss (2,191,992)     (2,191,992)
Adoption of ASC 606 240,017     240,017
Dividends declared on preferred stock (156,162)     (156,162)
Conversion of B-1 preferred stock to common stock (in shares) (60,420) 1,678,334          
Conversion of B-1 preferred stock to common stock $ (6) $ 168 (162)    
Conversion of dividends payable on B-1 preferred stock (in shares) 115,857          
Conversion of dividends payable on B-1 preferred stock $ 11 417,072     417,083
Balance at Mar. 31, 2018 $ 6 $ 5 $ 949 81,639,682 (69,028,467)     12,612,175
Balance (in shares) at Mar. 31, 2018 62,596 44,580 9,493,936          
Balance (in shares) at Dec. 31, 2017 62,596 105,000 7,691,324     62,596 105,000  
Balance at Dec. 31, 2017 $ 6 $ 11 $ 769 80,829,001 (67,076,492)     13,753,295
Net loss               (5,488,772)
Balance at Sep. 30, 2018 $ 1,398 85,543,597 (73,754,213)     11,790,782
Balance (in shares) at Sep. 30, 2018 13,972,158          
Balance (in shares) at Mar. 31, 2018 62,596 44,580 9,493,936          
Balance at Mar. 31, 2018 $ 6 $ 5 $ 949 81,639,682 (69,028,467)     12,612,175
Issuance of common stock for directors’ fees (in shares) 2,683          
Issuance of common stock for directors’ fees $ 1 6,508     6,509
Share-based compensation 143,034     143,034
Net loss (1,655,465)     (1,655,465)
Dividends declared on preferred stock (41,871)     (41,871)
Conversion of B-1 preferred stock to common stock (in shares) (44,580) 1,238,334          
Conversion of B-1 preferred stock to common stock $ (5) $ 123 (118)    
Conversion of dividends payable on B-1 preferred stock (in shares) 15,373          
Conversion of dividends payable on B-1 preferred stock $ 2 55,339     55,341
Conversion of A-1 preferred stock to common stock (in shares) (62,596) 1,738,778          
Conversion of A-1 preferred stock to common stock $ (6) $ 174 (168)    
Conversion of dividends payable on A-1 preferred stock (in shares) 98,893          
Conversion of dividends payable on A-1 preferred stock $ 10 356,005     356,015
Legal fees (15,212)     (15,212)
Rounding 1     1
Balance at Jun. 30, 2018 $ 1,259 82,143,199 (70,683,931)     11,460,527
Balance (in shares) at Jun. 30, 2018 12,587,997          
Issuance of common stock for directors’ fees (in shares) 4,161          
Issuance of common stock for directors’ fees 7,509     7,509
Share-based compensation 188,837     188,837
Net loss (1,641,315)     (1,641,315)
Legal fees (294,776)     (294,776)
Rounding 1 (1)    
Balance at Sep. 30, 2018 $ 1,398 85,543,597 (73,754,213)     11,790,782
Issuance of common stock pursuant to securities purchase agreement (in shares) 1,380,000          
Issuance of common stock pursuant to securities purchase agreement $ 138 2,069,862     2,070,000
Deemed dividend related to down-round features 1,428,966 (1,428,966)    
Balance (in shares) at Sep. 30, 2018 13,972,158          
Balance (in shares) at Dec. 31, 2018 13,977,868      
Balance at Dec. 31, 2018 $ 1,398 85,599,140 (75,134,316)     10,466,222
Issuance of common stock for directors’ fees (in shares) 13,820          
Issuance of common stock for directors’ fees $ 1 16,505     16,506
Share-based compensation 509,528     509,528
Net loss (1,803,508)     (1,803,508)
Balance at Mar. 31, 2019 $ 1,399 86,125,173 (76,937,824)     9,188,748
Balance (in shares) at Mar. 31, 2019 13,991,688          
Balance (in shares) at Dec. 31, 2018 13,977,868      
Balance at Dec. 31, 2018 $ 1,398 85,599,140 (75,134,316)     10,466,222
Net loss               (5,058,818)
Balance at Sep. 30, 2019 $ 1,440 87,310,964 (80,193,134)     7,119,270
Balance (in shares) at Sep. 30, 2019 14,398,701          
Balance (in shares) at Mar. 31, 2019 13,991,688          
Balance at Mar. 31, 2019 $ 1,399 86,125,173 (76,937,824)     9,188,748
Issuance of common stock for directors’ fees (in shares) 4,235          
Issuance of common stock for directors’ fees 5,505     5,505
Share-based compensation 125,549     125,549
Net loss (1,425,743)     $ (1,425,743)
Issuance of common stock for commitment fees (in shares) 300,000         310,000
Issuance of common stock for commitment fees $ 30 449,970     $ 450,000
Commitment fee adjustment (270,000)     (270,000)
Balance at Jun. 30, 2019 $ 1,429 86,436,197 (78,363,567)     8,074,059
Balance (in shares) at Jun. 30, 2019 14,295,923          
Issuance of common stock for directors’ fees (in shares) 6,111          
Issuance of common stock for directors’ fees $ 1 6,500     6,501
Share-based compensation 130,600     130,600
Net loss (1,829,567)     (1,829,567)
Issuance of common stock for commitment fees (in shares) 276,667          
Issuance of common stock for commitment fees $ 28 414,972     415,000
Commitment fee adjustment $ (18) 18    
Commitment fee adjustment (in shares) (180,000)          
Warrant debt discount valuation 595,662     595,662
Legal and commitment fees (272,985)     (272,985)
Balance at Sep. 30, 2019 $ 1,440 $ 87,310,964 $ (80,193,134)     $ 7,119,270
Balance (in shares) at Sep. 30, 2019 14,398,701