Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net loss	$ (3,006,485)	$ (19,244,618)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	669,040	731,101
Amortization	149,917	149,916
Amortization of deferred financing costs and debt discount	1,366,471	660,302
Share-based compensation	1,794,729	1,582,866
Loss on asset disposal	4,122
Non-cash royalty (income), net		(1,597,685)
Adjustment of warrants and debt conversion features	(9,081,354)	(640,755)
Changes in operating assets and liabilities:
Accounts receivable	2,868,900	3,737,168
Other receivables	19,298	(3,935)
Inventories	(1,342,544)	(473,568)
Prepaid expenses and other current assets	(398,952)	311,230
Other assets	2,144	(6,071)
Accounts payable	(974,612)	(866,138)
Accrued liabilities	71,203	884,923
Deferred revenue	(552,786)	18,939
Other liabilities	(2,307)	(4,894)
Net cash used in operating activities	(8,413,216)	(14,761,219)
Cash flows from investing activities
Purchase of equipment	(113,030)	(615,523)
Net cash used in investing activities	(113,030)	(615,523)
Cash flows from financing activities
Payments of term note	(2,000,000)
Proceeds from revolving line of credit	33,073,407	32,909,375
Payments of revolving line of credit	(40,363,204)	(28,100,000)
Proceeds from subordinated convertible debt, net of issuance costs	7,738,351
Payments of Cowen Debt	(925,533)
Payments of Biosense Debt		(1,572,587)
Proceeds from issuance of stock and warrants, net of issuance costs	9,167,756	151,600
Net cash provided by financing activities	6,690,777	3,388,388
Net decrease in cash and cash equivalents	(1,835,469)	(11,988,354)
Cash and cash equivalents at beginning of period	13,954,919	35,248,819
Cash and cash equivalents at end of period	$ 12,119,450	$ 23,260,465