Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows From Operating Activities:
Net loss	$ (13,062,656)	$ (13,995,868)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	975,480	1,053,465
Amortization of intangible assets	1,148,764	1,169,962
Stock-based compensation	1,022,618	1,002,824
Loss on disposal of property, plant and equipment	57,680	308,891
Realized loss on available for sale securities		22,421
Change in fair value of common stock warrant liability	(2,291,801)	(1,790,520)
Changes in operating assets and liabilities:
Accounts receivable	2,263,242	66,054
Inventory	843,388	4,164,884
Prepaid expenses and other current assets	712,279	227,216
Issuance of note receivable	(600,419)
Accounts payable, accrued expenses, product warranty reserve and other liabilities	(1,032,845)	(4,799,707)
Deferred revenue	1,557,520	(601,496)
Net cash used in operating activities	(8,406,750)	(13,171,874)
Cash Flows From Investing Activities:
Purchase of property, plant and equipment	(40,831)	(1,065,335)
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 provided by investing activities	17,069	9,379,061
Cash Flows From Financing Activities:
Purchase of treasury stock		(158,492)
Proceeds from issuance of common stock	17,192,500	22,027,166
Stock issuance costs	(1,402,230)	(1,862,293)
Repayment of borrowings under line of credit	(5,405,110)
Principal payments on long-term debt		(9,956)
Net cash provided by financing activities	10,385,160	19,996,425
Effect of exchange rate changes on cash	(955)	(7,757)
Increase in cash and cash equivalents	1,994,524	16,195,855
Cash and cash equivalents, beginning of period	13,856,893	10,955,403
Cash and cash equivalents, end of period	$ 15,851,417	$ 27,151,258