CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 39,625,879	$ 23,845,360
Marketable securities	9,576,760	18,096,091
Accounts receivable, net of allowance for doubtful accounts of $194,537 as of September 30, 2013 and $165,291 as of December 31, 2012	4,275,053	5,750,753
Other receivables, net	367,618	1,134,142
Prepaid expenses and other current assets	1,608,459	1,450,742
Total current assets	55,453,769	50,277,088
Property and equipment, net of accumulated depreciation and amortization of $15,599,302 as of September 30, 2013 and $14,633,037 as of December 31, 2012	4,679,286	5,672,000
Marketable securities	7,858,120	17,298,227
Other assets	12,197	69,957
Goodwill	27,997,286	25,726,239
Other intangibles, net of accumulated amortization of $7,912,147 as of September 30, 2013 and $6,699,283 as of December 31, 2012	11,085,143	11,190,557
Restricted cash	1,301,000	1,301,000
Total assets	108,386,801	111,535,068
Current Liabilities:
Accounts payable	2,121,205	3,813,955
Accrued expenses	4,110,176	5,921,152
Deferred revenue	23,300,954	21,080,759
Other current liabilities	783,462	632,618
Total current liabilities	30,315,797	31,448,484
Deferred tax liability	288,000	288,000
Other liabilities	4,087,449	4,340,749
Total liabilities	34,691,246	36,077,233
Stockholders’ Equity
Preferred stock; $0.01 par value; 10,000,000 shares authorized; 5,500 issued and outstanding as of September 30, 2013 and December 31, 2012; the aggregate liquidation preference totals $55,000,000 as of September 30, 2013 and December 31, 2012	55	55
Common stock; $0.01 par value; 100,000,000 shares authorized; 40,803,091 shares issued and 33,902,028 shares outstanding as of September 30, 2013, and 39,855,468 shares issued and 33,027,752 shares outstanding as of December 31, 2012	408,031	398,555
Additional paid-in capital	273,341,774	270,943,151
Accumulated other comprehensive income	(164,968)	(128,994)
Treasury stock at cost; 6,901,063 shares as of September 30, 2013 and 6,827,716 shares as of December 31, 2012	(12,110,108)	(11,974,261)
Accumulated deficit	(187,779,229)	(183,780,671)
Total stockholders’ equity	73,695,555	75,457,835
Total liabilities and stockholders’ equity	$ 108,386,801	$ 111,535,068