Stockholders' Equity (Stock-Based Compensation Expenses Included In The Condensed Consolidated Statements Of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expenses recognized	$ 3,897,000	$ 3,108,000	$ 2,224,000
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expenses recognized	1,169,000	779,000	873,000
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expenses recognized	212,000	424,000	257,000
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expenses recognized	$ 2,516,000	$ 1,905,000	$ 1,094,000