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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Country
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Country
Sep. 30, 2014
USD ($)
Schedule Of Accounting Policies [Line Items]        
Number of Countries in which Entity Operates | Country 14   14  
Loss from foreign currency transactions $ 294,000 $ 1,208,000 $ 1,062,000 $ 1,109,000
Percent of renewals within median VSOE range     80.00%  
Range within median renewal percentage rate     15.00%  
VSOE transaction agreement initial, Term years     2 years  
Cash equivalents maturity, Term     Cash equivalents are high-quality short term money market instruments and commercial paper, with original maturities of three months or less.  
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  
Warranty for hardware purchase     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  
Warranty for hardware purchase     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