Stockholders' Equity and Employee Stock Option Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 883	$ 1,383
Cost of product [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	108	143
Cost of service [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	27	15
Product development [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	343	542
Sales and marketing [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	89	308
General and administrative [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 316	$ 375