CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 16,361,604	$ 17,842,555
Marketable securities	20,230,823	18,903,635
Accounts receivable, net of allowances of $2,026,620 and $3,242,458, respectively	13,392,589	23,286,660
Prepaid expenses and other current assets	1,381,887	1,190,531
Inventory	1,413,953	1,409,659
Income tax receivable	431,572	385,682
Total current assets	53,212,428	63,018,722
Property and equipment, net of accumulated depreciation of $22,189,682 and $19,468,420, respectively	4,499,934	5,796,013
Long-term marketable securities	619,834	578,643
Deferred tax assets, net	220,285	235,197
Other assets, net	3,160,041	2,379,225
Goodwill	4,150,339	4,150,339
Other intangible assets, net	200,980	387,222
Total assets	66,063,841	76,545,361
Current liabilities:
Accounts payable	1,724,583	1,455,013
Accrued expenses	9,358,981	9,109,424
Deferred revenue, net	17,748,411	16,979,455
Total current liabilities	28,831,975	27,543,892
Other long-term liabilities	2,599,108	2,507,169
Deferred revenue, net	7,240,071	6,555,437
Total liabilities	38,671,154	36,606,498
Commitments and contingencies
Stockholders' equity:
Preferred stock - $.001 par value, 2,000,000 shares authorized
Common stock - $.001 par value, 100,000,000 shares authorized, 54,887,299 and 54,147,234 shares issued, respectively and 46,882,064 and 46,141,999 shares outstanding, respectively	54,887	54,147
Additional paid-in capital	155,836,039	150,884,184
Accumulated deficit	(79,810,994)	(62,557,515)
Common stock held in treasury, at cost (8,005,235 and 8,005,235 shares, respectively	(46,916,339)	(46,916,339)
Accumulated other comprehensive loss, net	(1,770,906)	(1,525,614)
Total stockholders' equity	27,392,687	39,938,863
Total liabilities and stockholders' equity	$ 66,063,841	$ 76,545,361