Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Country	Sep. 30, 2012	Sep. 30, 2013 Country	Sep. 30, 2012
Schedule Of Accounting Policies [Line Items]
Number of Countries in which Entity Operates	14		14
Gain on foreign currency transactions		$ 259		$ 259
Loss on foreign currency transactions	648	304	740	304
Percent of renewals within median VSOE range			80.00%
Range within median renewal percentage rate			15.00%
Software development costs were capitalized	$ 0		$ 0
Patents [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of assets			20 years
Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of assets			3 years
Product warranty period			1 year
Extended product warranty period			1 year
Minimum [Member] | Software Development Costs [Member]
Schedule Of Accounting Policies [Line Items]
Estimated economic life of product			2 years
Minimum [Member] | Proprietary Technology [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of assets			3 years
Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of assets			7 years
Product warranty period			2 years
Extended product warranty period			4 years
Maximum [Member] | Software Development Costs [Member]
Schedule Of Accounting Policies [Line Items]
Estimated economic life of product			5 years
Maximum [Member] | Proprietary Technology [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives of assets			7 years