Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Additional Information (Detail)

v2.4.1.9
Benefit Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Benefit plan related expenses $ 120,000us-gaap_EmployeeBenefitsAndShareBasedCompensation $ 39,000us-gaap_EmployeeBenefitsAndShareBasedCompensation