Condensed Consolidated Statements of Cash Flows (As Restated At Nine Months Ended September 30, 2010) (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities
Net income (loss)	$ 9,355,987	$ (6,222,880)
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities
Depreciation and amortization	1,063,366	956,602
Stock-based compensation expense	2,906,252	2,794,761
Amortization of investments	459,086	97,212
Tax benefit from exercise of stock options	(2,770,251)	(46,437)
Other non-cash items	(29,809)	(39,605)
Changes in assets and liabilities:
Accounts receivable	(2,787,852)	(589,786)
Inventories	(8,870,890)	(956,132)
Other current assets	(117,366)	49,886
Other assets	(52,894)	(54,797)
Accounts payable	319,080	351,590
Accrued liabilities	3,545,372	476,106
Accrued income taxes	231,254	(176,275)
Deferred revenue	2,803,472	(1,612,595)
Net cash from (used in) operating activities	6,054,807	(4,972,350)
Investing activities
Purchases of property and equipment	(945,889)	(3,592,144)
Purchases of short-term investments, marketable securities and other investments	(14,847,930)	(46,314,856)
Proceeds from sale of short-term investments, marketable securities and other investments	36,086,720	26,850,000
Net cash from (used in) investing activities	20,292,901	(23,057,000)
Financing activities
Proceeds from the exercise of stock options and warrants	164,608	48,708
Tax benefit from the exercise of stock options	2,770,251	46,437
Net cash from financing activities	2,934,859	95,145
Effect of exchange rate changes on cash and cash equivalents	40,167	95,163
Net increase (decrease) in cash and cash equivalents	29,322,734	(27,839,042)
Cash and cash equivalents, beginning of the period	55,099,319	81,948,482
Cash and cash equivalents, end of the period	84,422,053	54,109,440
Supplemental disclosure of cash flow information
Cash paid for income taxes	13,000	52,000
Supplemental noncash investing activities
Unrealized gain (loss) on marketable securities, net of taxes	$ 55,971	$ (56,657)