Annual report pursuant to Section 13 and 15(d)

Property Plant and Equipment - Additional Information (Detail)

v3.8.0.1
Property Plant and Equipment - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Depreciation, depletion and amortization, total $ 1,309,980 $ 957,836 $ 817,729
Computer Hardware [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 7 years    
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful lives remaining life of the lease.    
Minimum [Member] | Computer Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 1 year    
Maximum [Member] | Computer Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 2 years