Consolidated Balance Sheets (As Restated At December 31,2010) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 63,077,178	$ 55,099,319
Short-term investments	24,739,998	34,017,006
Total cash, cash equivalents and short-term investments	87,817,176	89,116,325
Accounts receivable, net of allowance of $796,610 and $833,199, respectively	9,853,682	5,349,835
Inventories	21,175,754	13,021,272
Other current assets	999,919	855,014
Total current assets	119,846,531	108,342,446
Marketable securities, at estimated fair value and other investments	21,268,777	13,850,197
Property and equipment, net	36,713,578	37,165,306
Other assets	232,594	219,554
Total assets	178,061,480	159,577,503
Liabilities:
Accounts payable	3,476,030	2,293,096
Accrued liabilities	12,437,921	10,742,581
Deferred revenue	4,423,980	4,394,081
Total current liabilities	20,337,931	17,429,758
Accrued income taxes	3,082,356	2,854,077
Total liabilities	23,420,287	20,283,835
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $.01 par value- Authorized - 1,500,000 shares Issued - none	0	0
Common stock, $.01 par value- Authorized - 45,000,000 shares Issued and outstanding - 19,573,244 and 18,925,549 shares, respectively	195,733	189,256
Additional paid-in capital	219,062,043	211,376,381
Accumulated other comprehensive loss	(263,849)	(490,806)
Accumulated deficit	(64,352,734)	(71,781,163)
Total stockholders' equity	154,641,193	139,293,668
Total liabilities and stockholders' equity	$ 178,061,480	$ 159,577,503