Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, and Equipment - Additional Information (Detail)

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Property, Plant, and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property Plant And Equipment [Abstract]        
Fixed assets acquired under capital lease     $ 405,000  
Depreciation expense $ 149,000 $ 160,000 $ 289,000 $ 317,000