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Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]        
Net income (loss) $ (1,858,778) $ (6,126,218) $ (1,774,133) $ (15,840,689)
Numerator, basic and diluted net income (loss) available to stockholders $ (1,858,778) $ (6,126,218) $ (1,774,133) $ (15,840,689)
Shares used in computation - basic:        
Weighted average common shares outstanding 7,544,345 7,469,455 7,542,728 7,340,272
Common shares outstanding for basic 7,544,345 7,469,455 7,542,728 7,340,272
Shares used in computation - diluted:        
Common shares outstanding for basic 7,544,345 7,469,455 7,542,728 7,340,272
Shares used in computing diluted net income per share 7,544,345 7,469,455 7,542,728 7,340,272
Net (loss) per share - basic $ (0.25) $ (0.84) $ (0.24) $ (2.16)
Net (loss) per share - diluted $ (0.25) $ (0.84) $ (0.24) $ (2.16)