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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]      
Cash equivalents carried at cost   $ 15,800,000 $ 16,600,000
Cash and cash equivalents of highly liquid investments with maturity date of purchase   three months or less  
Amount of Investment Securities   $ 2,700,000  
Percentage of investment securities   15.00%  
Determination percentage   50.00%  
Impairment of goodwill $ 0    
In-process research and development $ 0    
Uncertain income tax position   50.00%  
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Maturity period   1 year  
Estimated useful lives of assets   3 years  
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Maturity period   18 months  
Estimated useful lives of assets   5 years