Acquisitions - Purchase Price Allocation (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 18,711,947	$ 18,883,449
Bold [Member]
Business Acquisition [Line Items]
Cash	482,000
Current assets	126,000
Other assets	19,000
Deferred revenue	(424,000)
Other liabilities	(107,000)
Goodwill	11,178,000
Total purchase price	15,314,000
Bold [Member] | Technology [Member]
Business Acquisition [Line Items]
Business acquisition, Intangible assets	1,090,000
Bold [Member] | Trade Name and Trademark [Member]
Business Acquisition [Line Items]
Business acquisition, Intangible assets	30,000
Bold [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Business acquisition, Intangible assets	2,760,000
Bold [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Business acquisition, Intangible assets	$ 160,000