Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 17,970,019	$ 21,300,733
Short-term investments	5,186,263	5,108,189
Accounts receivable, net of allowance of $450,000 at June 30, 2012 and December 31, 2011	14,696,073	11,780,135
Inventory, net	10,466,858	11,484,761
Prepaid expenses and other current assets	2,192,802	2,089,676
Deferred income tax assets, net	6,783,830	9,968,929
Total current assets	57,295,845	61,732,423
Property and equipment, net	24,117,667	26,845,220
Deferred income tax assets, net	12,716,169	12,716,169
Intangible assets, net	3,336,419	3,224,006
Other long-term assets	294,219	444,933
Total assets	97,760,319	104,962,751
Current Liabilities:
Accounts payable	3,932,328	4,513,938
Accrued liabilities	6,582,285	7,643,004
Current portion of deferred revenue	3,573,020	3,317,641
Customer deposits	731,196	413,314
Total current liabilities	14,818,829	15,887,897
Deferred revenue, net of current portion	5,642,056	4,636,901
Liability for unrecorded tax benefits	2,012,366	1,982,399
Total liabilities	22,473,251	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 June 30, 2012 and December 31, 2011
Common stock, $0.00001 par value per share; 200 million shares authorized; 52,830,153 and 55,696,608 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	655	652
Additional paid-in capital	103,342,170	101,597,626
Treasury stock at cost, 12,669,989 and 9,556,183 shares at June 30, 2012 and December 31, 2011, respectively	(63,345,644)	(47,207,093)
Retained earnings	35,391,390	28,145,325
Accumulated other comprehensive loss	(101,503)	(80,956)
Total stockholders' equity	75,287,068	82,455,554
Total liabilities and stockholders' equity	$ 97,760,319	$ 104,962,751