Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 5,866,123	$ 8,390,233
Short term investments	5,076,930	5,052,921
Royalty receivables, net of reserves of $173,921 in 2013 and 92,723 in 2012	867,162	688,318
Prepaid expenses and other current assets	135,080	201,949
Total current assets	11,945,295	14,333,421
Fixed assets, net	64,365	59,041
Deposits and other assets	22,605	22,605
Total assets	12,032,265	14,415,067
Current liabilities:
Accounts payable	56,603	72,269
Accrued expenses and other	80,725	145,123
Deferred revenue	25,000	25,000
Total current liabilities	162,328	242,392
Commitments (note 8)
Shareholders' equity:
Common stock, par value $0.0001 per share; authorized 100,000,000 shares, issued and outstanding 23,109,665 and 22,646,782 shares for 2013 and 2012	2,311	2,265
Additional paid-in capital	105,184,600	101,642,297
Accumulated deficit	(93,316,974)	(87,471,887)
Total shareholders' equity	11,869,937	14,172,675
Total liabilities and shareholders' equity	$ 12,032,265	$ 14,415,067