Annual report pursuant to Section 13 and 15(d)

Supplementary Balance Sheet Information - Additional Information (Detail)

v3.3.1.900
Supplementary Balance Sheet Information - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Apr. 29, 2014
Accounts Receivable [Abstract]        
Allowances for doubtful accounts   $ 1,800,000 $ 1,700,000  
Provision for sales returns   210,000 110,000  
Provision for excess inventory and obsolete inventory   2,100,000 2,400,000  
Additional deferred revenue   119,000    
Litigation Settlement Receivable   1,400,000    
Legal settlement at present value   1,200,000    
Litigation Expense Recovered   731,000    
Settlement Expense For Dismissal of Patent Infringement Lawsuit Recovered   68,000    
Deferred royalty revenue recognized   119,000    
Deferred Royalties   $ 261,000    
Deferred training service revenue maximum recognition period   24 months    
Deferred training service revenue minimum recognition period   9 months    
Deferred revenue recognized $ 708,000      
Settled Litigation        
Accounts Receivable [Abstract]        
Deferred royalty revenue, net       $ 379,000
Licensing Agreements United States        
Accounts Receivable [Abstract]        
License period   3 years    
Licensing Agreements Outside of United States        
Accounts Receivable [Abstract]        
License period   5 years    
Assets Held Under Capital Lease        
Accounts Receivable [Abstract]        
Capital leased assets, Gross   $ 590,000 $ 0  
Accumulated depreciation related to assets held under capital lease   $ 118,000