Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities:
Net loss	$ (13,995,868)	$ (29,074,705)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and investment in leased property	1,053,465	1,612,944
Amortization of intangible assets	1,169,962	1,129,055
Stock-based compensation	1,002,824	892,410
Loss on disposal of property, plant and equipment	308,891	42,340
Provision for bad debts		10,160
Realized loss on available for sale securities	22,421
Net unrealized gains on trading securities		(3,135,032)
Change in fair value of auction rate debt securities repurchase agreement		3,135,032
Change in fair value of warrant liability	(1,790,520)
Changes in assets and liabilities:
Accounts receivable	66,054	(1,075,248)
Inventory	4,164,884	(3,751,612)
Prepaid expenses and other current assets	227,216	1,822,181
Accounts payable and accrued expenses	(4,799,707)	4,051,074
Deferred revenue	(601,496)	(162,346)
Net cash used in operating activities	(13,171,874)	(24,503,747)
Cash Flows From Investing Activities:
Purchase of property, plant and equipment	(1,065,335)	(1,214,992)
Investment in leased property, net		(283,561)
Restricted cash		(72)
Proceeds from disposal of property, plant and equipment	45,000	35,000
Proceeds from trading securities		33,925,001
Proceeds from maturities and sales of available-for-sale securities	10,399,396	45,904,306
Purchases of available-for-sale securities		(30,011,638)
Net cash provided by investing activities	9,379,061	48,354,044
Cash Flows From Financing Activities:
Purchase of treasury stock	(158,492)	(441,506)
Proceeds from issuance of common stock and warrants	22,027,166
Stock issuance costs	(1,862,293)
Repayment of borrowings under line of credit		(33,925,000)
Principal payments on long-term debt	(9,956)	(207,751)
Net cash provided by (used in) financing activities	19,996,425	(34,574,257)
Effect of exchange rate changes on cash	(7,757)	(67,709)
Increase (decrease) in cash and cash equivalents	16,195,855	(10,791,669)
Cash and cash equivalents, beginning of period	10,955,403	14,580,983
Cash and cash equivalents, end of period	$ 27,151,258	$ 3,789,314