CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (2,578,730)	$ (14,600,996)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of deferred revenue	(2,234,413)	(3,653,330)
Depreciation	1,092,305	1,329,279
Amortization of intangibles	34,194	1,234,272
Amortization of premium and discount on investments, net	(483,288)	(121,891)
Stock-based employee compensation	3,270,286	1,902,701
Stock-based non-employee compensation	2,899	43,308
Non-cash expense under a materials agreement	9,181	896,184
Stock-based compensation to Board of Directors and Scientific Advisory Board	1,252,275	660,983
Loss on stock warrant liability	4,190,283	5,231,626
Retirement plan benefit expense	1,145,154	684,164
Decrease (increase) in assets:
Accounts receivable	(4,513,407)	(1,352,085)
Inventory	(2,228,411)	(1,568)
Other current assets	270,851	(211,372)
Other assets	(95,855)	(38,835)
Increase in liabilities:
Accounts payable and accrued expenses	5,306,827	2,335,190
Deferred revenue	3,330,000	688,623
Other current liabilities	24,546
Net cash provided by (used in) operating activities	7,794,697	(4,973,747)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(2,208,403)	(218,609)
Purchase of intangibles	(439,644)
Purchase of short-term investments	(290,269,260)	(71,972,672)
Proceeds from sale of short-term investments	72,726,654	56,454,984
Net cash used in investing activities	(220,190,653)	(15,736,297)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuance of common stock	249,867,265	191,618
Proceeds from the exercise of common stock options and warrants	13,282,797	7,167,562
Payment of withholding taxes related to stock-based employee compensation	(3,998,516)	(1,147,522)
Net cash provided by financing activities	259,151,546	6,211,658
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	46,755,590	(14,498,386)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	20,368,852	22,701,126
CASH AND CASH EQUIVALENTS, END OF PERIOD	67,124,442	8,202,740
The following non-cash activities occurred:
Unrealized gain (loss) on available-for-sale securities	8,733	(8,072)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period	299,943	314,181
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes	1,113,483	929,552
Common stock issued for royalties that was earned in a previous period		81,273
Fair value of stock warrant liability reclassified to shareholders' equity upon exercise	$ 14,850,038