Segment Information (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 14,958,998	$ 22,152,802	$ 22,267,925	$ 20,163,787
Restricted cash and investments	215,963	215,405
Accounts receivable, net	5,755,288	8,597,464
Prepaid and other assets	580,243	625,451
Assets attributable to discontinued operations		3,000,000
Total current assets	21,510,492	34,591,122
Furniture, fixtures and equipment, net	768,693	863,309
Intangible assets, net	16,523,634	17,155,195
Deferred tax asset, net	3,928,420	3,685,420
Goodwill	54,824,648	54,824,648
Other assets	80,180	98,412
Total assets	97,636,067	111,218,106
Current liabilities:
Current portion of debt		5,690,940
Accrued expenses and other liabilities	2,800,447	3,352,445
Liability for option cancellations	363,874	240,515
Deferred revenue	14,434,852	15,706,851
Liabilities attributable to discontinued operations	12,447,222	8,048,568
Total current liabilities	30,046,395	33,039,319
Other long-term liabilities	613,856	668,456
Deferred tax liability, net
Total liabilities	30,660,251	33,707,775
Total stockholders' equity	66,975,816	77,510,331
Total liabilities and stockholders' equity	97,636,067	111,218,106
Reis Services [Member]
Current assets:
Cash and cash equivalents	14,829,000	18,505,000
Restricted cash and investments	216,000	215,000
Accounts receivable, net	5,755,000	8,597,000
Prepaid and other assets	273,000	198,000
Assets attributable to discontinued operations
Total current assets	21,073,000	27,515,000
Furniture, fixtures and equipment, net	733,000	821,000
Intangible assets, net	16,524,000	17,155,000
Deferred tax asset, net
Goodwill	57,203,000	57,203,000
Other assets	80,000	99,000
Total assets	95,613,000	102,793,000
Current liabilities:
Current portion of debt		5,691,000
Accrued expenses and other liabilities	1,948,000	2,257,000
Liability for option cancellations
Deferred revenue	14,435,000	15,707,000
Liabilities attributable to discontinued operations
Total current liabilities	16,383,000	23,655,000
Other long-term liabilities	614,000	668,000
Deferred tax liability, net	15,174,000	13,151,000
Total liabilities	32,171,000	37,474,000
Total stockholders' equity	63,442,000	65,319,000
Total liabilities and stockholders' equity	95,613,000	102,793,000
Discontinued Operations [Member]
Current assets:
Cash and cash equivalents
Restricted cash and investments
Accounts receivable, net
Prepaid and other assets
Assets attributable to discontinued operations		3,000,000
Total current assets		3,000,000
Furniture, fixtures and equipment, net
Intangible assets, net
Deferred tax asset, net
Goodwill
Other assets
Total assets		3,000,000
Current liabilities:
Current portion of debt
Accrued expenses and other liabilities
Liability for option cancellations
Deferred revenue
Liabilities attributable to discontinued operations	12,276,000	8,032,000
Total current liabilities	12,276,000	8,032,000
Other long-term liabilities
Deferred tax liability, net
Total liabilities	12,276,000	8,032,000
Total stockholders' equity	(12,276,000)	(5,032,000)
Total liabilities and stockholders' equity		3,000,000
Other segment [Member]
Current assets:
Cash and cash equivalents	130,000	3,648,000
Restricted cash and investments
Accounts receivable, net
Prepaid and other assets	307,000	428,000
Assets attributable to discontinued operations
Total current assets	437,000	4,076,000
Furniture, fixtures and equipment, net	36,000	42,000
Intangible assets, net
Deferred tax asset, net	3,928,000	3,685,000
Goodwill	(2,378,000)	(2,378,000)
Other assets
Total assets	2,023,000	5,425,000
Current liabilities:
Current portion of debt
Accrued expenses and other liabilities	852,000	1,095,000
Liability for option cancellations	364,000	241,000
Deferred revenue
Liabilities attributable to discontinued operations	171,000	17,000
Total current liabilities	1,387,000	1,353,000
Other long-term liabilities
Deferred tax liability, net	(15,174,000)	(13,151,000)
Total liabilities	(13,787,000)	(11,798,000)
Total stockholders' equity	15,810,000	17,223,000
Total liabilities and stockholders' equity	$ 2,023,000	$ 5,425,000