Balance Sheets (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 4,606,267	$ 5,718,504
Investment securities – available for sale, at fair value	47,255,487	37,156,381
Accrued interest receivable on investment securities	339,791	212,048
Advances, deposits and other current assets	620,979	675,186
Total current assets	52,822,524	43,762,119
Property and equipment (at cost, less accumulated depreciation of $1,349,690 and $1,264,190, respectively)	747,386	832,886
Other assets:
Deposits, deferred fees and other assets	1,120,931	1,054,942
Patent licensing fees, net	18,750	20,625
Total other assets	1,139,681	1,075,567
Total assets	54,709,591	45,670,572
Current liabilities:
Accounts payable	2,102,013	1,452,436
Accrued liabilities	2,205,838	2,707,653
Notes payable - current portion	439,218	10,891
Deferred revenue - current portion	500,000	500,000
Total current liabilities	5,247,069	4,670,980
Common stock warrant liability		3,026
Notes payable – non-current portion	4,560,782	5,000,000
Deferred revenue - non-current portion	3,875,000	4,000,000
Other non-current liabilities	467,545	472,731
Total liabilities	14,150,396	14,146,737
Stockholders' equity:
Common stock, $0.01 par value; 75,000,000 shares authorized; 17,347,665 and 13,737,970 shares issued at March 31, 2014 and December 31, 2013, and 17,217,066 and 13,604,975 shares outstanding at March 31, 2014 and December 31, 2013, respectively	173,477	137,380
Additional paid-in capital	217,535,506	203,139,142
Accumulated other comprehensive loss	(27,897)	(44,166)
Accumulated deficit	(174,744,150)	(169,287,157)
Subtotal	42,936,936	33,945,199
Treasury stock, at cost (130,599 and 132,995 shares at March 31, 2014 and December 31, 2013, respectively)	(2,377,741)	(2,421,364)
Total stockholders' equity	40,559,195	31,523,835
Total liabilities and stockholders' equity	$ 54,709,591	$ 45,670,572