Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,969,416	$ 1,737,847
Royalties receivable, net of reserves of $1,094,774 in 2018 and $1,051,424 in 2017	689,677	597,441
Prepaid expenses and other current assets	52,729	29,697
Total current assets	3,711,822	2,364,985
Fixed assets, net	313,177	482,561
Deposits and other assets	33,567	33,567
Total assets	4,058,566	2,881,113
Current liabilities:
Accounts payable	133,486	58,090
Accrued expenses and other	273,606	254,833
Deferred revenue	50,570	824
Total current liabilities	457,662	313,747
Warrant liability	501,414
Shareholders' equity:
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 27,665,211 in 2018 and 24,043,846 in 2017	2,767	2,404
Additional paid-in capital	114,787,657	111,627,789
Accumulated deficit	(111,690,934)	(109,062,827)
Total shareholders' equity	3,099,490	2,567,366
Total liabilities and shareholders' equity	$ 4,058,566	$ 2,881,113