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Summary of Property and Equipment Accompanying Consolidated Balance Sheets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 35,456,062us-gaap_PropertyPlantAndEquipmentGross	$ 30,572,922us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(21,990,872)	(18,498,936)
Property and equipment, net	13,465,190us-gaap_PropertyPlantAndEquipmentNet	12,073,986us-gaap_PropertyPlantAndEquipmentNet
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,813,790	21,799,376
Equipment under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,874,259	4,477,231
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,703,013	2,231,315
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,065,000	$ 2,065,000