Consolidated Statements of Cash Flows (As Restated At December 31,2010) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income (loss)	$ 7,428,429	$ (8,774,956)	$ (10,459,034)
Adjustments to reconcile net income (loss) to cash from (used in) operating activities:
Depreciation and amortization	1,423,233	1,313,811	612,633
Stock-based compensation expense	3,640,185	3,799,031	7,068,273
Amortization of investments	482,784	348,061	0
Change in deferred tax assets	38,912	(29,798)	4,586,034
Tax Benefit From Stock Options Exercised	(2,858,229)	(164,969)	(436,828)
Other non-cash items	55,619	(20,854)	192,679
Changes in assets and liabilities:
Accounts receivable	(4,526,311)	(906,885)	1,943,833
Inventories	(8,126,861)	(1,674,508)	5,198,413
Other current assets	(61,163)	1,240,891	436,843
Other assets	(52,894)	(54,797)	(117,296)
Accounts payable	1,212,223	(803,238)	(1,068,386)
Accrued liabilities	5,672,354	2,655,790	3,318,500
Accrued income taxes	228,279	(111,000)	0
Deferred revenue	(41,387)	(1,020,566)	(956,041)
Net cash from (used in) operating activities	4,515,173	(4,203,987)	10,319,623
Investing activities:
Purchases of property and equipment	(979,495)	(3,840,846)	(21,016,646)
Purchases of marketable securities	(20,311,101)	(12,032,241)	0
Purchases of short-term investments	(18,713,647)	(34,272,925)	(25,000,000)
Proceeds from sale of marketable securities	4,925,000	2,125,000	725,000
Proceeds from sale of short-term investments	35,486,720	25,000,000	0
Net cash from (used in) investing activities	407,477	(23,021,012)	(45,291,646)
Financing activities:
Proceeds from the exercise of stock options and warrants	164,609	102,354	151,897
Excess tax benefit from the exercise of equity	2,858,229	164,969	436,828
Costs incurred related to purchase of stock for treasury	0	0	(258,490)
Proceeds from short-term borrowings on credit facilities	0	0	6,000,000
Payments on short-term borrowings on credit facilities	0	0	(12,000,000)
Net cash from (used in) financing activities	3,022,838	267,323	(5,669,765)
Effect on exchange rate changes on cash and cash equivalents	32,371	108,513	(10,869)
Net increase (decrease) in cash and cash equivalents	7,977,859	(26,849,163)	(40,652,657)
Cash and cash equivalents, beginning of the period	55,099,319	81,948,482	122,601,139
Cash and cash equivalents, end of the period	63,077,178	55,099,319	81,948,482
Supplemental disclosure of cash flow information:
Cash paid for income taxes	467,000	59,172	36,493
Supplemental disclosure of noncash financing and investing activities:
Issuance of stock for employer 401(k) matching contribution	650,127	573,580	543,079
Unrealized gain (loss) on marketable securities, net of taxes	$ 69,190	$ (54,795)	$ 380,910