CONDENSED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (1,414,706)	$ (1,255,711)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	89,451	102,941
Stock-based compensation expense	35,103	70,475
Changes in operating assets and liabilities:
Accounts receivable, net	(46,842)	(68,501)
Federal grant receivable		117,946
Inventory	30,626	31,908
Prepaid expenses and other current assets	(42,318)	(27,278)
Accounts payable	(33,404)	(133,274)
Accrued expenses	42,222	(154,490)
Deferred revenue	341,126	155,826
Liabilities of discontinued operations		(5,268)
Net cash used in operating activities	(998,742)	(1,165,426)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of fixed assets	(5,000)	(1,681)
Net cash used in investing activities	(5,000)	(1,681)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from employee stock purchase plan	7,910	9,135
Net cash provided by financing activities	7,910	9,135
Net decrease in cash and cash equivalents	(995,832)	(1,157,972)
Cash and cash equivalents, beginning of period	1,728,222	3,999,029
Cash and cash equivalents, end of period	732,390	2,841,057
Supplemental disclosures of cash flow information:
Cash paid for income taxes
Cash paid for interest	$ 99,548	$ 90,110