Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (27,872,293)	$ (20,321,812)	$ (14,573,353)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,252,142	1,238,044	1,327,794
Share-based compensation	6,931,438	3,553,414	1,437,174
Loss on disposal of equipment and other assets	126	621	0
Realized loss (gain) on available for sale securities	12,226	(5,220)	1,671
Changes in operating assets and liabilities:
Prepaid and other assets	443,639	248,411	(125,463)
Accounts payable and accrued expenses	421,943	768,096	470,962
Deferred rent	(50,634)	(145,237)	24,668
Total adjustments	9,010,880	5,658,129	3,136,806
Net cash used in operating activities	(18,861,413)	(14,663,683)	(11,436,547)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of available for sale securities	(27,096,006)	(16,799,888)	(9,439,760)
Proceeds from redemption of available for sale securities	18,160,000	13,800,000	10,725,000
Purchases of property and equipment	(78,509)	(135,541)	(100,649)
Payments for patent costs and other intangible assets	(652,029)	(1,026,736)	(609,851)
Net cash (used in) provided by investing activities	(9,666,544)	(4,162,165)	574,740
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock in public and private offerings	27,327,975	17,555,674	10,556,754
Net proceeds from exercise of options and warrants	1,147,380	1,381,694	330,938
Principal payments on capital lease obligation	(22,928)	(26,731)	(25,845)
Net cash provided by financing activities	28,452,427	18,910,637	10,861,847
NET CHANGE IN CASH AND CASH EQUIVALENTS	(75,530)	84,789	40
CASH AND CASH EQUIVALENTS, beginning of year	298,227	213,438	213,398
CASH AND CASH EQUIVALENTS, end of year	222,697	298,227	213,438
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest expense	7,095	8,843	5,716
Cash paid for income taxes	0	0	0
SUPPLEMENTAL SCHEDULE OF NON-CASH ACTIVITIES:
Key-man life insurance premiums (Note 3)	0	29,330	45,780
Purchases of leasehold improvements (Note 11)	0	30,462	27,572
Purchase of equipment under capital lease (Note 5)	$ 0	$ 71,925	$ 0