Consolidated Statements of Cash Flows (As Restated At December 31,2010) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net (loss) income	$ (6,171,159)	$ 7,428,429	$ (8,774,956)
Adjustments to reconcile net (loss) income to net cash (used in) from operating activities:
Depreciation and amortization	1,468,611	1,423,233	1,313,811
Stock-based compensation expense	2,608,094	3,640,185	3,799,031
Inventory charge related to excess consumer product inventory	3,800,000	0	0
Amortization of investments	194,160	482,784	348,061
Excess tax benefit from the exercise of equity	(225,002)	(2,858,229)	(164,969)
Other non-cash items	122,631	94,531	(50,652)
Changes in assets and liabilities:
Accounts receivable	(706,326)	(4,526,311)	(906,885)
Inventories	(4,253,197)	(8,126,861)	(1,674,508)
Other current assets	335,690	(61,163)	1,240,891
Other assets	(200,000)	(52,894)	(54,797)
Accounts payable	(1,943,229)	1,212,223	(803,238)
Accrued liabilities	(2,513,286)	5,672,354	2,655,790
Accrued income taxes	173,732	228,279	(111,000)
Deferred revenue	(192,981)	(41,387)	(1,020,566)
Net cash (used in) from operating activities	(7,502,262)	4,515,173	(4,203,987)
Investing activities:
Purchases of property and equipment	(643,962)	(979,495)	(3,840,846)
Purchases of short-term investments, marketable securities and other investments	(34,521,664)	(39,024,748)	(46,305,166)
Proceeds from sale of short-term investments, marketable securities and other investments	35,744,879	40,411,720	27,125,000
Net cash from (used in) investing activities	579,253	407,477	(23,021,012)
Financing activities:
Proceeds from the exercise of stock options and warrants	68,100	164,609	102,354
Excess tax benefit from the exercise of equity	225,002	2,858,229	164,969
Costs incurred related to purchase of stock for treasury	(1,395,494)	0	0
Net cash (used in) from financing activities	(1,102,392)	3,022,838	267,323
Effect on exchange rate changes on cash and cash equivalents	64,551	32,371	108,513
Net (decrease) increase in cash and cash equivalents	(7,960,850)	7,977,859	(26,849,163)
Cash and cash equivalents, beginning of the period	63,077,178	55,099,319	81,948,482
Cash and cash equivalents, end of the period	55,116,328	63,077,178	55,099,319
Supplemental disclosure of cash flow information:
Cash paid for income taxes	202,232	467,000	59,172
Supplemental disclosure of noncash financing and investing activities:
Issuance of stock for employer 401(k) matching contribution	578,319	650,127	573,580
Unrealized gain (loss) on marketable securities, net of taxes	7,200	69,190	(54,795)
Issuance of restricted stock units	0
Issuance of restricted stock awards	$ 802,636	$ 0	$ 0