Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stockholders' Equity (Details) (USD $)	3 Months Ended
Stockholders' Equity (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in common stock	162,094
Common stock, shares outstanding	26,468,413us-gaap_CommonStockSharesOutstanding		26,630,507us-gaap_CommonStockSharesOutstanding
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	290,473
Stock Issued During Period, Shares, Employee Stock Purchase Plans	19,590
Stock Repurchased and Retired During Period, Shares	342,508
Shares Surrendered By Employees To Pay Taxes	$ 129,649
Stock-based compensation expense	1,480,000	1,188,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	215,851
Product and content development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	584,000	443,000
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	370,000	239,000
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 526,000	$ 506,000