Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows From Operating Activities:
Net loss	$ (6,583,102)	$ (7,243,200)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	486,275	504,740
Amortization of intangible assets	575,773	581,489
Stock-based compensation	524,055	392,174
Loss on disposal of property, plant and equipment	57,680
Realized loss on available for sale securities		22,421
Change in fair value of common stock warrant liability	(1,238,750)
Changes in operating assets and liabilities:
Accounts receivable	419,638	(129,923)
Inventory	2,245,528	1,075,822
Prepaid expenses and other current assets	717,034	351,209
Accounts payable, accrued expenses, product warranty reserve and other liabilities	(2,121,367)	(2,385,856)
Deferred revenue	1,441,497	(384,189)
Net cash used in operating activities	(3,475,739)	(7,215,313)
Cash Flows From Investing Activities:
Purchase of property, plant and equipment		(966,875)
Proceeds from disposal of property, plant and equipment	57,900
Proceeds from maturities and sales of available-for-sale securities		10,399,396
Net cash provided by investing activities	57,900	9,432,521
Cash Flows From Financing Activities:
Purchase of treasury stock		(158,179)
Proceeds from issuance of common stock	17,685,403
Stock issuance costs	(1,891,378)
Repayment of borrowings under line of credit	(5,405,110)
Principal payments on long-term debt		(9,956)
Net cash provided by (used in) financing activities	10,388,915	(168,135)
Effect of exchange rate changes on cash	1,064	(2,479)
Increase in cash and cash equivalents	6,972,140	2,046,594
Cash and cash equivalents, beginning of period	13,856,893	10,955,403
Cash and cash equivalents, end of period	$ 20,829,033	$ 13,001,997