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Description of the Company and Summary of Significant Accounting Policies - Activity in Company's Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Balance at beginning of year $ 652 $ 452
Charged to expense 641 204
(Write-offs), net of recoveries (356) (4)
Balance at end of year $ 937 $ 652