CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                            
Net loss $ (4,931,125) $ (14,774,392) $ (2,096,349) $ (8,213,793) $ (3,800,227) $ (12,972,142) $ (19,194,236) $ (3,094,298)            
Adjustments to reconcile net loss to net cash used in operating activities:                            
Depreciation         1,096 1,178 1,544 8,039            
Loss on disposal of assets           804 803 1,788            
Fixed assets provided to university in lieu of cash               18,004            
Stock-based compensation expense 170,106   154,508   514,683 484,720 674,961 608,676            
Amortization of warrants and stock issued for services [1]               30,000            
Change in fair value of derivative liabilities         (2,024,660) 1,653,477 6,503,174 (767,198)            
Fair value of derivative liabilities in excess of proceeds         322,644 7,174,634                
Fair value of warrant liability in excess of proceeds             7,174,634              
Financing transaction costs           (137,192) (137,192)              
Loss on common stock issuance from conversion of accrued interest             9,794              
Loss on extinguishment of secured convertible promissory note - related party           590,392 590,392              
Amortization of debt discount         438,964 34,608 58,536              
Common stock issued for services               187,550            
Changes in assets and liabilities:                            
Prepaid expenses         (302,248) 194,906 198,235 [1] (121,273) [1]            
Deposits and other assets               34,290            
Other current assets         (766) (2,609) (2,609) 7,014            
Accounts payable         191,333 (55,418) (85,324) (173,729)            
Accounts payable to related party           15,000                
Accrued payroll and related expenses             11,701 (112,825)            
Accrued expenses             (21,811) 42,677            
Other current liabilities         134,469 (48,407)                
Net cash used in operating activities         (4,524,712) (2,928,857) (3,943,014) (3,331,285)            
Cash flows from investing activities:                            
Purchases of property and equipment           (4,385) (4,385) (19,654)            
Net cash used in investing activities           (4,385) (4,385) (19,654)            
Cash flows from financing activities:                            
Proceeds from Common stock issuance, net of $16,901 issuance costs           3,233,099                
Proceeds from Emerald Financing, net of $154,092 issuance costs             3,095,908              
Proceeds from Series B warrant exercises           98,700 98,700              
Proceeds from secured convertible promissory note - related party           400,000 400,000 500,000            
Proceeds from convertible multi-draw credit agreement, net of $9,301 for nine months ended 30 Sep 2019 and $53,707 for the year ended 31 Dec 2018 issuance costs         3,990,699   1,946,293              
Net cash provided by financing activities         3,990,699 3,731,799 5,540,901 3,513,002            
Net (decrease) increase in cash and restricted cash         (534,013) 798,557 1,593,502 162,063          
Cash, cash equivalents and restricted cash, beginning of period   1,857,885   264,383 1,857,885 264,383 264,383 102,320            
Cash, cash equivalents and restricted cash, end of period 1,323,872   1,062,940   1,323,872 1,062,940 1,857,885 264,383 102,320          
Reconciliation of cash and restricted cash:                            
Cash and cash equivalents                   $ 1,319,360 $ 1,853,373 $ 1,058,438 $ 259,955
Restricted cash                   4,512 4,512 4,502 4,428
Total cash and restricted cash shown in the condensed consolidated statements of cash flows $ 1,323,872 $ 1,857,885 $ 1,062,940 $ 264,383 1,323,872 1,062,940 1,857,885 264,383 $ 102,320 $ 1,323,872 $ 1,857,885 $ 1,062,940 $ 264,383 $ 102,320
Cash paid during the period for                            
Interest         272,611   23,334              
Income taxes         1,600 1,642 1,642 1,631            
Supplemental disclosures of non-cash financing activities:                            
Conversion of outstanding preferred stock into common stock           1,947,227 1,947,228 1,386,000            
Conversion of outstanding preferred stock subject to redemption into common stock           828,916 828,915 1,197,450            
Fair value of warrants issued in connection with financings           10,424,634 10,424,634              
Fair value of common stock issued in extinguishment of convertible debt and accrued interest           1,710,000 1,713,766              
Proceeds allocated to equity classified warrants issued with convertible multi-draw credit agreement         716,110   315,080              
Reclassification of warrant liabilities to equity from exercise of warrants         144,375 $ 1,333,866 1,539,866              
Fair value of compound derivative liability issued with convertible multi-draw credit agreement         193,414   204,102              
Beneficial conversion feature on convertible multi-draw credit agreement         $ 1,584,850   $ 90,080              
Series D Preferred Stock                            
Cash flows from financing activities:                            
Proceeds from Issuance of Preferred Stock and Preference Stock [2]               1,131,857            
Series F Preferred stock                            
Cash flows from financing activities:                            
Proceeds from Issuance of Preferred Stock and Preference Stock               $ 1,881,145            
[1] During the year ended December 31, 2017, warrants issued to service providers for consulting services were valued at $30,000 and were recorded as a Prepaid expense and amortized over the service period.
[2] During the year ended December 31, 2017 preferred deemed dividends of $333,000 was recognized on Series F Preferred Stock, $536,000 was recognized on Series D Preferred Stock and $175,000 on Series C Preferred Stock.