Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities:
Net loss	$ (23,388,120)	$ (20,286,414)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	1,459,159	1,600,143
Amortization of intangible assets	1,726,854	1,754,568
Stock-based compensation	1,500,352	1,602,097
Loss on disposal of property, plant and equipment	57,680	308,902
Gain on sale of leased assets		(673,358)
Realized loss on available for sale securities		22,421
Change in fair value of common stock warrant liability	(3,726,667)	(4,204,787)
Changes in operating assets and liabilities:
Accounts receivable	5,728,228	(1,028,099)
Inventory	(2,650,413)	5,303,221
Prepaid expenses and other current assets	341,585	(180,390)
Issuance of note receivable	(585,611)
Accounts payable, accrued expenses, product warranty reserve and other liabilities	1,787,625	(2,914,462)
Deferred revenue	2,201,139	(456,295)
Net cash used in operating activities	(15,548,189)	(19,152,453)
Cash Flows From Investing Activities:
Purchase of property, plant, and equipment	(292,389)	(1,156,163)
Restricted cash		525,000
Proceeds from sale of leased assets		673,358
Proceeds from disposal of property, plant and equipment	57,900	45,000
Proceeds from maturities and sales of available-for-sale securities		10,399,396
Net cash (used in) provided by investing activities	(234,489)	10,486,591
Cash Flows From Financing Activities:
Purchase of treasury stock		(158,492)
Proceeds from issuance of common stock	17,192,500	22,583,877
Stock issuance costs	(1,402,230)	(1,891,378)
Repayments under line of credit, net	(4,405,110)
Principal payments on long-term debt		(9,956)
Net cash provided by financing activities	11,385,160	20,524,051
Effect of exchange rate changes on cash	2,029	(11,407)
(Decrease) increase in cash and cash equivalents	(4,395,489)	11,846,782
Cash and cash equivalents, beginning of period	13,856,893	10,955,403
Cash and cash equivalents, end of period	$ 9,461,404	$ 22,802,185