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Business and Basis of Presentation (Additional Information) (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jun. 30, 2013
Schedule Of Summary Of Significant Accounting Policies [Line Items]            
Highly-liquid debt instruments maturity days 90 days          
Inventories $ 450,000   $ 450,000   $ 386,000  
Inventories, work-in-process 232,000   232,000   270,000  
Inventories, finished goods 218,000   218,000   116,000  
Prompyt pay discount, percent of gross sales     0      
Amortization of certain acquired intangible assets 70,000 43,000 259,000 43,000    
Income tax expense (benefit) 0 1,159,000 0 (62,000)    
Marketable securities           $ 5,786,000
Minimum [Member] | Equipment and Furnishings [Member]
            
Schedule Of Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives 3 years          
Maximum [Member] | Equipment and Furnishings [Member]
            
Schedule Of Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives 5 years