Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 24,349,583	$ 21,300,733
Short term investments	5,333,847	5,108,189
Accounts receivable, net of allowance of $450,000 at March 31, 2012 and December 31, 2011	14,303,273	11,780,135
Inventory, net	11,118,750	11,484,761
Prepaid expenses and other current assets	2,675,003	2,089,676
Deferred income tax assets, net	8,150,516	9,968,929
Total current assets	65,930,972	61,732,423
Property and equipment, net	25,632,688	26,845,220
Deferred income tax assets, net	12,716,169	12,716,169
Intangible assets, net	3,239,102	3,224,006
Other long-term assets	349,326	444,933
Total assets	107,868,257	104,962,751
Current Liabilities:
Accounts payable	3,807,316	4,513,938
Accrued liabilities	6,337,302	7,643,004
Current portion of deferred revenue	3,500,594	3,317,641
Customer deposits	516,984	413,314
Total current liabilities	14,162,196	15,887,897
Deferred revenue, net of current portion	4,679,357	4,636,901
Liability for unrecorded tax benefits	1,994,767	1,982,399
Total liabilities	20,836,320	22,507,197
Commitments and Contingencies
Stockholders' Equity
Preferred stock, $0.00001 par value per share; 25 million shares authorized; no shares issued and outstanding at March 31, 2012 and December 31, 2011
Common stock, $0.00001 par value per share; 200 million shares authorized; 55,702,742 and 55,696,608 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively	652	652
Additional paid-in capital	102,370,309	101,597,626
Treasury stock at cost, 9,556,183 shares at March 31, 2012 and December 31, 2011	(47,207,093)	(47,207,093)
Retained earnings	31,949,143	28,145,325
Accumulated other comprehensive loss	(81,074)	(80,956)
Total stockholders' equity	87,031,937	82,455,554
Total liabilities and stockholders' equity	$ 107,868,257	$ 104,962,751