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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Cash flows from operating activities:          
Net loss $ (5,342,935) $ (5,904,515) $ (10,399,813) $ (8,271,967)  
Adjustments to reconcile net loss to net cash from operating activities:          
Depreciation and amortization     378,990 362,027  
Change in fair value of earn-out milestone liability     297,570 (3,002,939)  
Fair value of warrants issued in connection with amendment to modify the GEN-1 earn-out milestone payments 400,000  
Recognition of deferred revenue     (250,000) (250,000)  
Stock-based compensation costs     1,030,726 1,308,492  
Shares issued in exchange for services     5,350  
Deferred income tax asset     1,819,324  
Amortization of deferred finance charges and debt discount associated with notes payable     192,793 191,724  
Net changes in:          
Accrued interest on investment securities     13,503 2,636  
Advances, deposits and other current assets     (60,104) (931,654)  
Accounts payable and accrued liabilities     (946,265) 24,460  
Net cash (used in) operating activities:     (7,923,276) (10,161,871)  
Cash flows from investing activities:          
Purchases of investment securities     (9,940,894) (13,279,686)  
Proceeds from sale and maturity of investment securities     15,100,000 11,900,000  
Purchases of property and equipment     (11,837) (262,728)  
Net cash provided by (used in) investing activities     5,147,269 (1,642,414)  
Cash flows from financing activities:          
Proceeds from sale of common stock equity, net of issuance costs     18,182,599 4,464,060  
Proceeds from issuance of common stock upon conversion of stock options     371,895  
Proceeds from Payroll Protection Program (PPP) loans     1,324,750  
Repayments on Payroll Protection Program (PPP) loans     (1,324,750)  
Net cash provided by financing activities     18,554,494 4,464,060  
Increase (decrease) in cash and cash equivalents     15,778,487 (7,340,225)  
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 22,653,760 6,013,318 22,653,760 6,013,318 $ 6,875,273
Supplemental disclosures of cash flow information:          
Interest paid     (487,174) (508,471)  
Cash paid for amounts included in measurement of lease liabilities:          
Operating cash flows from lease payments 130,595 130,595 261,190 261,190  
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 bonus payments     498,632  
Realized and unrealized (gains) losses, net, on investment securities $ 4,053 $ 7,752 $ (34,912) $ 64,704