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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (2,293,451) $ (1,697,665)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 94,693 43,941
Stock-based compensation 125,930
Loss on sale of asset 1,774
Change in assets and liabilities:    
Royalty receivables (17,151) (552,064)
Prepaid expenses and other current assets 58,476 26,596
Deferred revenue 20,000 22,722
Accounts payable and accrued expenses 223,299 (116,590)
Net cash used in operating activities (1,912,360) (2,147,130)
Cash flows from investing activities:    
Purchases of fixed assets (5,018) (310,796)
Change in investments (5,141) (7,315)
Net cash used in investing activities (10,159) (318,111)
Cash flows from financing activities:    
Net proceeds from exercise of options and warrants 490,623
Net cash provided by financing activities 490,623
Net decrease in cash and cash equivalents (1,922,519) (1,974,618)
Cash and cash equivalents at beginning of year 5,712,310 7,569,537
Cash and cash equivalents at end of period $ 3,789,791 $ 5,594,919