CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents (Note 3)	$ 29,817,517	$ 23,845,360
Marketable securities (Note 3)	17,045,356	18,096,091
Accounts receivable, net of allowance for doubtful accounts of $195,292 as of March 31, 2013 and $165,291 as of December 31, 2012	4,990,607	5,750,753
Other receivables, net	886,538	1,134,142
Prepaid expenses and other current assets	1,270,987	1,450,742
Total current assets	54,011,005	50,277,088
Property and equipment, net of accumulated depreciation and amortization of $14,798,360 as of March 31, 2013 and $14,633,037 as of December 31, 2012	5,306,110	5,672,000
Marketable securities (Note 3)	12,149,600	17,298,227
Other assets	27,006	69,957
Goodwill	25,726,239	25,726,239
Other intangibles, net of accumulated amortization of $7,077,177 as of March 31, 2013 and $6,699,283 as of December 31, 2012	10,810,113	11,190,557
Restricted cash (Note 3)	1,301,000	1,301,000
Total assets	109,331,073	111,535,068
Current Liabilities:
Accounts payable	2,440,528	3,813,955
Accrued expenses	4,812,138	5,921,152
Deferred revenue	22,382,355	21,080,759
Other current liabilities	623,782	632,618
Total current liabilities	30,258,803	31,448,484
Deferred tax liability	288,000	288,000
Other liabilities	4,301,819	4,340,749
Total liabilities	34,848,622	36,077,233
Stockholders’ Equity
Preferred stock; $0.01 par value; 10,000,000 shares authorized; 5,500 issued and outstanding as of March 31, 2013 and December 31, 2012; the aggregate liquidation preference totals $55,000,000 as of March 31, 2013 and December 31, 2012	55	55
Common stock; $0.01 par value; 100,000,000 shares authorized; 40,369,452 shares issued and 33,474,123 shares outstanding as of March 31, 2013, and 39,855,468 shares issued and 33,027,752 shares outstanding as of December 31, 2012	403,695	398,555
Additional paid-in capital	271,751,728	270,943,151
Accumulated other comprehensive income	(50,344)	(128,994)
Treasury stock at cost; 6,895,329 shares as of March 31, 2013 and 6,827,716 shares as of December 31, 2012	(12,099,328)	(11,974,261)
Accumulated deficit	(185,523,355)	(183,780,671)
Total stockholders’ equity	74,482,451	75,457,835
Total liabilities and stockholders’ equity	$ 109,331,073	$ 111,535,068