Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows for operating activities:
Net loss	$ (9,981,105)	$ (16,891,148)	$ (11,917,500)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	376,932	523,756	578,666
Intangible asset impairment	192,500
Stock-based compensation	837,040	1,184,570	2,132,835
Inventory charges	98,556	2,075,494	363,902
Warrants fair value adjustment			5,175,136
Changes in operating assets and liabilities:
Accounts receivable	682,846	1,733,767	103,123
Inventories	550,549	71,308	683,298
Prepaid expenses and other current assets	110,400	(199,105)	(90,921)
Accounts payable	370,060	(827,791)	885,671
Legal settlement			(3,705,866)
Accrued expenses and compensation	240,433	(753,995)	(120,035)
Deferred revenue, deferred costs, and other	(256,609)	(223,970)	(225,396)
Net cash used in operating activities	(6,778,398)	(13,307,114)	(6,137,087)
Cash flows for investing activities:
Purchases of investments			(7,495,000)
Maturities of investments		7,495,000	7,495,000
Purchases of fixed assets	(110,987)	(306,451)	(342,115)
Purchase of technological and intellectual property			(350,000)
Release of restricted cash	178,500
Net cash provided by (used in) investing activities	67,513	7,188,549	(692,115)
Cash flows from financing activities:
Net proceeds from issuance of common stock and warrants, including private placement and equity plans	33,614	195,679	17,486,849
Payments on capital lease	(19,092)	(27,715)	(22,521)
Net cash provided by financing activities	14,522	167,964	17,464,328
Net (decrease) increase in cash and cash equivalents	(6,696,363)	(5,950,601)	10,635,126
Cash and cash equivalents, beginning of year	16,986,809	22,937,410	12,302,284
Cash and cash equivalents, end of year	10,290,446	16,986,809	22,937,410
Supplemental disclosure of cash flow information:
Equipment acquired under capital lease, net		60,410
Common stock issued to consultants			97,500
Warrants issued in Securities Purchase Agreement			$ 14,496,627