Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net loss	$ (2,093,222)	$ (2,856,600)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	845,207	868,950
Stock compensation expense	251,518	361,579
Allowance for excess inventory quantities		2,728
Termination charges		350,000
Changes in assets and liabilities related to operations:
Trade accounts receivable	(327,069)	53,331
Other receivables	(76,860)	448,346
Inventories	140,859	(358,363)
Prepaid expenses and other current assets	(73,283)	(144,170)
Accounts payable	(334,392)	391,978
Accrued expenses	(650,307)	341,672
Net cash used in operating activities	(2,317,549)	(540,549)
Investing activities:
Acquisition of equipment and leasehold improvements	(61,221)	(152,169)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(52,444)	(10,873)
Purchases of investments		(3,999,502)
Sales of investments		7,564,106
Net cash (used in) provided by investing activities	(113,665)	3,401,562
Financing activities:
Principal payments on debt obligations, including capital leases	(748)	(6,279)
Proceeds from exercise of stock options	4,080
Net cash provided by (used in) financing activities	3,332	(6,279)
(Decrease) increase in cash and cash equivalents	(2,427,882)	2,854,734
Cash and cash equivalents at beginning of period	5,744,322	3,899,393
Cash and cash equivalents at end of period	3,316,440	6,754,127
Supplemental cash flow information:
Interest paid	3,763	1,768
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 18,261	$ 74,823