Condensed Consolidated Balance Sheets (As Restated At December 31, 2010) (Unaudited) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 84,422,053	$ 55,099,319
Short-term investments	15,761,276	34,017,006
Total cash, cash equivalents and short-term investments	100,183,329	89,116,325
Accounts receivable, net	8,127,732	5,349,835
Inventories	21,901,469	13,021,272
Other current assets	1,066,171	855,014
Total current assets	131,278,701	108,342,446
Marketable securities and other investments	10,398,516	13,850,197
Property and equipment, net	37,046,179	37,165,306
Other assets	243,430	219,554
Total assets	178,966,826	159,577,503
Current liabilities
Accounts payable	2,577,017	2,293,096
Accrued liabilities	11,474,714	10,742,581
Deferred revenue	7,229,709	4,394,081
Total current liabilities	21,281,440	17,429,758
Accrued income taxes	3,085,331	2,854,077
Total liabilities	24,366,771	20,283,835
Commitments and contingencies (Note 11)
Stockholders' equity
Preferred stock, $0.01 par value- Authorized - 1,500,000 shares Issued - none	0	0
Common stock, $0.01 par value- Authorized - 45,000,000 shares Issued and outstanding - 19,030,503 and 18,925,549 shares, respectively	190,305	189,256
Additional paid-in capital	217,216,443	211,376,381
Accumulated other comprehensive loss	(381,517)	(490,806)
Accumulated deficit	(62,425,176)	(71,781,163)
Total stockholders' equity	154,600,055	139,293,668
Total liabilities and stockholders' equity	$ 178,966,826	$ 159,577,503