Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Country	Jun. 30, 2011	Jun. 30, 2012 Country	Jun. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]
Number of Countries in which Entity Operates	15		15
Gains resulting from foreign currency transactions	$ 49	$ 30	$ 46	$ 58
Percent of renewals within median VSOE range			80.00%
Range within median renewal percentage rate			15.00%
Software development costs were capitalized	0		0
Maximum [Member]
Cash and Cash Equivalents [Line Items]
Estimated useful lives of assets			7 years
Product warranty period			2 years
Extended product warranty period			4 years
Minimum [Member]
Cash and Cash Equivalents [Line Items]
Estimated useful lives of assets			3 years
Product warranty period			1 year
Extended product warranty period			1 year
Software Development Costs [Member] | Maximum [Member]
Cash and Cash Equivalents [Line Items]
Estimated economic life of product			5 years
Software Development Costs [Member] | Minimum [Member]
Cash and Cash Equivalents [Line Items]
Estimated economic life of product			2 years
Patents [Member]
Cash and Cash Equivalents [Line Items]
Estimated useful lives of assets			20 years
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Line Items]
Fair value of cash and cash Equivalents in money market funds or demand bank deposits	72,551		72,551
Cash and Cash Equivalents [Member] | Bank Time Deposits [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents in bank time deposits	12,594		12,594
Fair value of Cash and cash equivalents in bank time deposits	$ 12,596		$ 12,596