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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net loss $ (3,313,961) $ (28,638,778)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 28,018 6,603
Stock-based compensation expense 324,667 366,383
Warrant related expense, change in fair value, and other financing expenses 26,015,746
Non-cash interest expense 1,356 57,185
Changes in operating assets and liabilities:    
Prepaid expenses, deposits and other assets (92,944) (99,737)
Accounts payable, accrued expenses and other liabilities (236,420) (1,123,303)
Net cash used in operating activities (3,289,284) (3,415,901)
Cash flows used in investing activities:    
Purchases of property and equipment (6,372)
Net cash used in investing activities (6,372)
Cash flows provided by financing activities:    
Proceeds from the sale of common stock 10,846,062
Proceeds from the sale of Series A convertible preferred stock, net 14,269,095
Payment of offering costs (253,765) (187,649)
Net cash provided by financing activities 10,592,297 14,081,446
Net increase in cash and cash equivalents 7,303,013 10,659,173
Cash and cash equivalents at beginning of period 8,896,468 1,552,852
Cash and cash equivalents at end of period 16,199,481 12,212,025
Supplemental disclosure of non-cash financing activities:    
Reclassification of accrued dividends related to the issuance of common stock to the Series A convertible preferred stock holders 1,148,307
Reclassification of deferred offering costs upon completion of private placement 180,456
Offering costs in accounts payable and accrued expenses 174,777 178,258
Series A cumulative preferred dividends (85,993)  
Issuance of subscription receivable upon sale of Series A convertible preferred stock (8,280,935)
Series A Preferred Stock [Member]    
Supplemental disclosure of non-cash financing activities:    
Series A cumulative preferred dividends $ (85,993) $ (58,845)