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Summary of Operations and Significant Accounting Policies - Summary of Allowance for Doubtful Accounts (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]      
Allowance for doubtful accounts, beginning balance $ 291,000 $ 242,000 $ 381,000
Charges to expense 116,000 103,000 300,000
Write-offs of uncollectible accounts, net of recoveries (139,000) (54,000) (439,000)
Allowance for doubtful accounts, ending balance $ 268,000 $ 291,000 $ 242,000