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Restatement of Previously Issued Financial Statements - Impact on Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]      
Unrealized gains (losses) on marketable securities, tax $ (9) $ 3 [1] $ (31) [1]
As Previously Reported [Member]      
Quantifying Misstatement in Current Year Financial Statements [Line Items]      
Unrealized gains (losses) on marketable securities, tax   $ 3 $ (31)
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements