XML 34 R24.htm IDEA: XBRL DOCUMENT v3.5.0.2
Cash Equivalents and Investments - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Cash Equivalents And Investments [Line Items]    
Cash equivalents $ 8.1 $ 13.9
Cash Equivalents [Member]    
Cash Equivalents And Investments [Line Items]    
Cash equivalents $ 8.1 $ 13.9
Maximum [Member]    
Cash Equivalents And Investments [Line Items]    
Long-term investments maturity period, in years 7 years  
Short-Term investments maturity period, in years 1 year  
Minimum [Member]    
Cash Equivalents And Investments [Line Items]    
Long-term investments maturity period, in years 1 year