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Property and Equipment, net, and Other Assets - Components of Property and Equipment, Net, and Other Assets (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 3,150,098 $ 3,783,399
Accumulated depreciation (2,193,231) (2,442,549)
Property and equipment, net 956,867 1,340,850
Security deposits and other assets 363,475 1,074,071
Property and Equipment net and other assets 1,320,342 2,414,921
Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 544,984 544,984
Computer equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 700,893 990,790
Office furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 541,464 634,547
Machinery and equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 804,722 971,806
Leasehold improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 558,035 $ 641,272