Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (19,527,046)	$ (14,526,364)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment	1,019,609	580,536
Amortization of intangible assets	63,887	47,862
Share-based compensation expense	6,436,813	5,998,962
Amortization of premium on investments	440,507	167,056
Amortization of discount on convertible senior notes	2,597,153
Amortization of deferred financing costs	139,252
Other	340,100	284,998
Change in operating assets and liabilities:
Accounts receivable	3,526,642	3,528,615
Inventories, net	(7,547,061)	(6,757,485)
Prepaid expenses and other current assets	(2,247,717)	(389,974)
Accounts payable	(554,869)	356,854
Accrued expenses and other current liabilities	1,309,423	1,430,473
Net cash used in operating activities	(14,003,307)	(9,278,467)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of investments	(80,128,177)	(16,644,600)
Maturities of investments	25,000,000
Additions to property, plant and equipment	(4,667,787)	(2,497,481)
Additions to patents	(253,940)	(283,410)
Proceeds from disposition of assets	98,225
Net cash used in investing activities	(59,951,679)	(19,425,491)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common stock		62,760,450
Payment of common stock issuance costs	(600)	(4,359,934)
Proceeds from exercise of stock options	599,614	2,804,101
Net cash provided by financing activities	599,014	61,204,617
Effect of exchange rate changes on cash and cash equivalents	51,334	(9,402)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(73,304,638)	32,491,257
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD	192,148,312	50,834,714
CASH AND CASH EQUIVALENTS - END OF PERIOD	$ 118,843,674	$ 83,325,971