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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Installment
Dec. 31, 2014
USD ($)
Schedule Of Significant Accounting Policies [Line Items]    
Maximum maturity period of highly liquid investments 3 months  
Allowances for doubtful accounts | $ $ 344,000 $ 357,000
Accruals for premium deficiency | $ $ 0 $ 0
Minimum [Member]    
Schedule Of Significant Accounting Policies [Line Items]    
Short-term investment maturity period 3 months  
Useful life of property and equipment 3 years  
Number of installments to pay policy premiums | Installment 2  
Maximum [Member]    
Schedule Of Significant Accounting Policies [Line Items]    
Useful life of property and equipment 27 years 6 months  
Number of installments to pay policy premiums | Installment 4