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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Cash flows from operating activities:      
Net loss $ (5,056,878) $ (2,367,452)  
Adjustments to reconcile net loss to net cash from operating activities:      
Depreciation and amortization 188,329 188,806  
Change in fair value of earn-out milestone liability 41,274 (3,130,000)  
Fair value of warrants issued in connection with amendment to modify the GEN-1 earn-out milestone payments 400,000  
Recognition of deferred revenue (125,000) (125,000)  
Stock-based compensation costs 451,965 691,145  
Deferred income tax asset 1,819,324  
Amortization of deferred finance charges and debt discount associated with notes payable 96,066 97,458  
Net changes in:      
Accrued interest on investment securities (1,344) (9,761)  
Receivable on sale of net operating losses (1,819,324)  
Advances, deposits and other current assets (64,527) (645,864)  
Accounts payable and accrued liabilities (504,952) (635,190)  
Net cash (used in) operating activities: (4,975,067) (5,535,858)  
Cash flows from investing activities:      
Purchases of investment securities (9,940,534) (11,251,818)  
Proceeds from sale and maturity of investment securities 8,000,000 5,400,000  
Purchases of property and equipment (8,235) (145,162)  
Net cash used in investing activities (1,948,769) (5,996,980)  
Cash flows from financing activities:      
Proceeds from sale of common stock equity, net of issuance costs 5,794,747 1,754,885  
Net cash provided by financing activities 5,794,747 1,754,885  
Decrease in cash and cash equivalents (1,129,089) (9,777,953)  
Cash and cash equivalents at beginning of period 6,875,273 13,353,543 $ 13,353,543
Cash and cash equivalents at end of period 5,746,184 3,575,590 $ 6,875,273
Supplemental disclosures of cash flow information:      
Interest paid 243,299 253,289  
Cash paid for amounts included in measurement of lease liabilities:      
Operating cash flows from lease payments 130,631 106,000  
Non-cash financing and investing activities      
Fair value of warrants issued in connection with amendment to modify the GEN-1 earn-out milestone payments 400,000  
Right of use assets 1,797,561  
Stock issued in lieu of cash bonuses 498,632  
Realized and unrealized (gains) losses, net, on investment securities $ (38,965) $ 56,952