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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (624,594) $ (803,897)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 44,619 48,919
Warrant market adjustment 247,590
Bad debts expense (recovery) (5,237)
Change in assets and liabilities:    
Royalty receivables (85,354) (74,685)
Prepaid expenses and other current assets (123,257) (98,715)
Accounts payable and accrued expenses (35,589) (52,414)
Deferred revenue 71,189 651
Net cash used in operating activities (758,223) (732,551)
Cash flows from investing activities:    
Purchases of fixed assets (55) (134)
Proceeds from sale of fixed assets 3,713
Net cash provided by (used in) investing activities 3,658 (134)
Cash flows from financing activities:    
Net proceeds from issuances of common stock and warrants and exercise of options and warrants 1,101,782
Net cash provided by financing activities 1,101,782
Net (decrease) increase in cash and cash equivalents (754,565) 369,097
Cash and cash equivalents at beginning of period 6,591,960 2,969,416
Cash and cash equivalents at end of period $ 5,837,395 $ 3,338,513