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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2016
USD ($)
Country
Mar. 31, 2015
USD ($)
Schedule Of Accounting Policies [Line Items]    
Number of Countries in which Entity Operates | Country 15  
Gain (loss) from foreign currency transactions $ 199,000 $ (617,000)
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.  
Goodwill impairment $ 0  
Software development costs were capitalized 0  
Changes in cash flow from financing activities 0 $ (410,000)
Change in Accounting Method Accounted for as Change in Estimate [Member]    
Schedule Of Accounting Policies [Line Items]    
Reduction in provision for income taxes 91,000  
Changes in cash flow from operating activities 91,000  
Changes in cash flow from financing activities $ (91,000)  
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