CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 16,616,646	$ 17,842,555
Marketable securities	20,857,697	18,903,635
Accounts receivable, net of allowances of $1,692,826 and $3,242,458, respectively	17,556,090	23,286,660
Prepaid expenses and other current assets	1,500,848	1,190,531
Inventory	1,218,828	1,409,659
Income tax receivable	385,682	385,682
Total current assets	58,135,791	63,018,722
Property and equipment, net of accumulated depreciation of $21,489,285 and $19,468,420, respectively	5,187,547	5,796,013
Long-term marketable securities	620,134	578,643
Deferred tax assets, net	220,285	235,197
Other assets, net	3,079,242	2,379,225
Goodwill	4,150,339	4,150,339
Other intangible assets, net	161,686	387,222
Total assets	71,555,024	76,545,361
Current liabilities:
Accounts payable	2,406,796	1,455,013
Accrued expenses	9,715,324	9,109,424
Deferred revenue, net	18,332,448	16,979,455
Total current liabilities	30,454,568	27,543,892
Other long-term liabilities	2,565,712	2,507,169
Deferred revenue, net	7,457,507	6,555,437
Total liabilities	40,477,787	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, 54,699,671 and 54,147,234 shares issued, respectively and 46,694,436 and 46,141,999 shares outstanding, respectively	54,700	54,147
Additional paid-in capital	154,091,705	150,884,184
Accumulated deficit	(74,412,818)	(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	(1,740,011)	(1,525,614)
Total stockholders' equity	31,077,237	39,938,863
Total liabilities and stockholders' equity	$ 71,555,024	$ 76,545,361