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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (2,413,859) $ (4,238,410) $ (4,279,856)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 175,643 188,501 140,170
Stock based compensation 76,299 67,531 725,016
Loss on sale of fixed asset 1,775
Bad debts, net of recovery 43,215 480,563 324,286
Change in assets and liabilities:      
Royalty receivables 476,490 (283,035) (463,743)
Prepaid expenses and other current assets 227,195 (123,427) (12,213)
Accounts payable, accrued expenses and other (56,347) (98,941) (14,472)
Deferred revenue 824
Net cash used in operating activities (1,470,540) (4,005,443) (3,580,812)
Cash flows from investing activities:      
Purchases of fixed assets (6,549) (11,715) (316,185)
Proceeds from sale of fixed asset 6,000
Proceeds from sale of investments 1,523,333 (9,549) 1,491,295
Net cash provided by (used in) investing activities 1,516,784 (15,264) 1,175,110
Cash flows from financing activities:      
Net proceeds from issuances of common stock and exercise of options and warrants 548,475
Net cash provided by financing activities 548,475
Net increase (decrease) in cash and cash equivalents 46,244 (4,020,707) (1,857,227)
Cash and cash equivalents at beginning of year 1,691,603 5,712,310 7,569,537
Cash and cash equivalents at end of year $ 1,737,847 $ 1,691,603 $ 5,712,310