CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 13,293,780	$ 18,651,468
Restricted cash	750,000	750,000
Marketable securities	7,838,590	10,530,942
Accounts receivable, net of allowances of $419,332 and $940,101, respectively	9,737,521	14,130,302
Prepaid expenses and other current assets	2,556,121	2,796,665
Inventory	904,198	642,819
Deferred tax assets, net	407,008	464,031
Total current assets	35,487,218	47,966,227
Property and equipment, net of accumulated depreciation of $17,260,956 and $16,131,570, respectively	3,930,107	3,980,679
Deferred tax assets, net	86,465	86,465
Software development costs, net	1,245,126	1,161,822
Other assets, net	2,432,546	2,185,148
Goodwill	4,150,339	4,150,339
Other intangible assets, net	178,978	174,426
Total assets	47,510,779	59,705,106
Current liabilities:
Accounts payable	2,076,073	2,801,372
Accrued expenses	14,363,908	16,720,582
Deferred revenue, net	17,524,607	17,831,653
Total current liabilities	33,964,588	37,353,607
Other long-term liabilities	2,689,636	2,618,818
Deferred tax liabilities, net	175,647	167,875
Deferred revenue, net	5,174,282	6,311,865
Total liabilities	42,004,153	46,452,165
Commitments and contingencies
Stockholders' equity:
Preferred stock - $.001 par value, 2,000,000 shares authorized	0	0
Common stock - $.001 par value, 100,000,000 shares authorized, 56,019,952 and 55,615,972 shares issued, respectively and 48,014,717 and 47,610,737 shares outstanding, respectively	56,020	55,616
Additional paid-in capital	164,502,458	162,673,833
Accumulated deficit	(110,497,857)	(100,910,119)
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	(1,637,656)	(1,650,050)
Total stockholders' equity	5,506,626	13,252,941
Total liabilities and stockholders' equity	$ 47,510,779	$ 59,705,106