CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Preferred Stock - Series A
Preferred Stock - Series B
Preferred Stock - Series C
Preferred Stock - Series D
Preferred Stock - Series E
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Deficit
Balance at Dec. 31, 2015 $ 33,239,441 $ 0 $ 0 $ 0 $ 0 $ 1 $ 2,173 $ 170,529,953 $ 0 $ (137,292,686)
Balance (in shares) at Dec. 31, 2015   0 0 0 0 9,375 21,723,049      
Issuance of common stock for cash 19,795,476 $ 0 $ 0 $ 0 $ 0 $ 0 $ 654 19,794,822 0 0
Issuance of common stock for cash (in shares)   0 0 0 0 0 6,544,412      
Issuance of common stock in connection with the conversion of preferred stock 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 13 (13) 0 0
Issuance of common stock in connection with the conversion of preferred stock (in shares)   0 0 0 0 (429) 130,669      
Issuance of common stock for services 55,599 $ 0 $ 0 $ 0 $ 0 $ 0 $ 1 55,598 0 0
Issuance of common stock for services (in shares)   0 0 0 0 0 15,323      
Stock-based compensation in connection with restricted common stock unit grants 1,725,417 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 1,725,417 0 0
Cancellation of common stock 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (2) 2 0 0
Cancellation of common stock (in shares)   0 0 0 0 0 (24,075)      
Preferred stock deemed dividend 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 3,599,565 0 (3,599,565)
Net loss (15,635,575) 0 0 0 0 0 0 0 0 (15,635,575)
Balance at Dec. 31, 2016 39,180,358 $ 0 $ 0 $ 0 $ 0 $ 1 $ 2,839 195,705,344 0 (156,527,826)
Balance (in shares) at Dec. 31, 2016   0 0 0 0 8,946 28,389,378      
Issuance of common stock for cash 13,193,831 $ 0 $ 0 $ 0 $ 0 $ 0 $ 514 13,193,317 0 0
Issuance of common stock for cash (in shares)   0 0 0 0 0 5,141,736      
Issuance of common stock for services 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 2 (2) 0 0
Issuance of common stock for services (in shares)   0 0 0 0 0 21,586      
Issuance of common stock for payment of accounts payable 8,250 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 8,250 0 0
Issuance of common stock for payment of accounts payable (in shares)   0 0 0 0 0 2,351      
Issuance of restricted common stock unit for accounts payable 65,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 65,000 0 0
Issuance of restricted common stock unit for services 68,002 0 0 0 0 0 0 68,002 0 0
Stock-based compensation in connection with restricted common stock unit grants 1,110,111 0 0 0 0 0 0 1,110,111 0 0
Stock-based compensation in connection with stock warrant grants 86,899 0 0 0 0 0 0 86,899 0 0
Cancellation of common stock 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (1) 1 0 0
Cancellation of common stock (in shares)   0 0 0 0 0 (10,926)      
Vested accrued RSU bonuses 511,526 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 511,526 0 0
Preferred stock deemed dividend 0 0 0 0 0 0 0 1,068,624 0 (1,068,624)
Net loss (13,094,501) 0 0 0 0 0 0 0 0 (13,094,501)
Balance at Dec. 31, 2017 $ 41,129,476 $ 0 $ 0 $ 0 $ 0 $ 1 $ 3,354 $ 211,817,072 $ 0 $ (170,690,951)
Balance (in shares) at Dec. 31, 2017   0 0 0 0 8,946 33,544,125