Statements of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net loss	$ (26,517,688)	$ (17,432,641)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	1,095,613	1,320,082
Amortization	224,875	155,500
Amortization of warrants	995,926	906,525
Share-based compensation	1,741,184	1,361,352
Loss on asset disposal	83,705	5,039
Non-cash royalty (income), net	(2,353,718)	(2,490,119)
Warrant adjustment	(3,251,822)	(49,830)
Changes in operating assets and liabilities:
Accounts receivable	9,381,579	242,804
Other receivables	(5,719)	4,596
Inventories	(425,031)	(891,938)
Prepaid expenses and other current assets	246,982	797,438
Other assets	(3,284)	0
Accounts payable	(1,789,687)	2,873,467
Accrued liabilities	(813,483)	(346,707)
Deferred revenue	1,436,934	(531,576)
Other liabilities	(5,647)	(8,552)
Net cash used in operating activities	(19,959,281)	(14,084,560)
Cash flows from investing activities
Purchase of equipment	(972,881)	(605,673)
Net cash used in investing activities	(972,881)	(605,673)
Cash flows from financing activities
Proceeds from revolving line of credit	52,309,376	42,469,200
Payments of revolving line of credit	(46,409,376)	(35,833,334)
Payments of short-term debt	(3,448,210)	0
Payments of long-term debt	0	(1,300,782)
Proceeds from issuance of stock and warrants, net of issuance costs	211,416	601,327
Net cash provided by financing activities	2,663,206	5,936,411
Net decrease in cash and cash equivalents	(18,268,956)	(8,753,822)
Cash and cash equivalents at beginning of period	35,248,819	30,546,550
Cash and cash equivalents at end of period	$ 16,979,863	$ 21,792,728