Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net loss	$ (19,244,618)	$ (12,288,744)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	731,101	926,511
Amortization	149,916	66,667
Amortization of warrants	660,302	621,348
Share-based compensation	1,582,866	751,876
Loss on asset disposal	0	4,556
Non-cash royalty (income), net	(1,597,685)	(1,628,842)
Warrant adjustment	(640,755)	(970,052)
Changes in operating assets and liabilities:
Accounts receivable	3,737,168	(2,995,127)
Other receivables	(3,935)	(4,984)
Inventories	(473,568)	93,698
Prepaid expenses and other current assets	311,230	643,079
Other assets	(6,071)	0
Accounts payable	(866,138)	1,885,786
Accrued liabilities	884,923	(489,064)
Deferred revenue	18,939	255,543
Other liabilities	(4,894)	(5,879)
Net cash used in operating activities	(14,761,219)	(13,133,628)
Cash flows from investing activities
Purchase of equipment	(615,523)	(548,959)
Net cash used in investing activities	(615,523)	(548,959)
Cash flows from financing activities
Proceeds from revolving line of credit	32,909,375	25,500,000
Payments of revolving line of credit	(28,100,000)	(20,333,334)
Payments of short-term debt	(1,572,587)	0
Payments of long-term debt	0	(563,768)
Proceeds from issuance of stock and warrants, net of issuance costs	151,600	547,388
Net cash provided by financing activities	3,388,388	5,150,286
Net decrease in cash and cash equivalents	(11,988,354)	(8,532,301)
Cash and cash equivalents at beginning of period	35,248,819	30,546,550
Cash and cash equivalents at end of period	$ 23,260,465	$ 22,014,249