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